1 
 STATUTORY INSTRUMENTS  
 
2013 No. ---- 
 
THE NATIONAL ENVIRONMENT  (AIR QUALITY) REGULA TIONS , 2013  
________________  
 
ARRANGEMENT OF REGULATIONS  
 
REGULATIONS  
 
PART I —PRELIMINARY  
1 Citation  
2 Commencement  
3. Purpose  
4. Application  
    5. Interpretation  
PART II —INDUSTRIAL FACILITIES ADJACENT TO RESIDENTIAL 
AREAS  
6 Industrial lay outs  
7 Industrial use  
8 Interpretation of local physical development plan  
9 Refusal of approval  
 
PART III — COMPLIANCE WITH AIR QUALITY STANDARDS  
10 Compliance with standards  
11 Prohibition  
12 Permissible emission limits   
PART IV - RESTRICTION ON EMISSION FROM CERTAIN ACTIVITIES  
13 Burning waste  
14. Erection of incinerators   
2 
     15. Accompanying documents  
    16. Conditions for approval  
    17. Open burning  
    18. Conditions of a licence  
19. Burning of tyres  
20. Burning of oil  
21. Cement factories  
22. Motor vehicles  
23. Permiss ible dark smoke limits for new facilities  
24. Permissible dark smoke limits for existing facilities  
25. Exceptions  
26. Water vapour  
27. Occupier to test and keep records  
 
PART V - AIR QUALITY MANAGEMENT AND MONITORING  
28.  Air quality management plan  
29. Contents of air quality management plans  
30. Reporting on implementing of air quality management plan  
31. Air quality monitoring  
 
PART VI - MISCELLANEOUS  
32. Offences and penalties  
 
SCHEDULES   
Schedule 1:     
Schedule 2:   
3 
 Schedule 3:  
Schedule 4: Currency po int 
Schedule 5:  
Schedule 6:  
Schedule 7:  
Schedule 8: Currency point  
 
  
4 
  
STATUTORY INSTRUMENTS  
2013 No. -------  
The National Environment (Air Quality) Regulations , 2013 
 
(Under Section 107 of the National Environment Act , 1995 ) 
IN EXERCISE of the powers conferred upon the Minister by the National Environment 
Act,1995  these Regulations are made this ______ day of ______, 2013 . 
PART I —PRELIMINARY  
1 Citation  
These Regulations may be cited as the National Environment (Air Quality) Regulation.  
2 Commencement  
These Regulations shall come into force on a date specified by the Minister by notice 
published in the Gazette.  
3 Purpose of the Regulations  
The purpose of these Regulations is to - 
(1) Enforce the  air quality standards,  
(2) Prevent air pollution and ecological de gradation  
(3) Set baseline parameters on air quality and emissions based on a number 
of practices considerations and acceptable limits  
(4) Prescribe general measures for the control of air pollution in all areas 
including residential and commercial areas.  
(5) Ensure p rotection of human health and the environment from various 
sources of pollution  
4. Application  
(1) These Regulations apply to any activity requiring a pollution licence under Section 
58(4) of the Act.  
(2) Notwithstanding the generality of subsection (1) th e regulations shall apply to: - 
(a) any premises used for any industrial or trade purposes, or on which matter is 
burnt in connection with any industrial or trade purpose including burning of 
waste, or any other premises prescribed by the Authority  
(b) any facility  or process that discharges or is capable of discharging air pollutants 
into open air   
5 
 (c) any activity which results in atmospheric emissions and which the Authority 
believes has of may have significant detrimental effect on the environment 
including health, social conditions, economic conditions, ecological conditions or 
cultural he  
(d) industrial plants and  
(e) fuel burning equipment . 
(3) The limits shown under these regulations shall be of general application except for 
those areas where the Minister prescribes s pecial or specific limits for some categories 
of pollution sources as separate standards for the peculiar pollutants characteristics and 
loads.  
(4) The Minister may on recommendation of the Authority make any variation, addition 
or amend any of the schedul es to these regulations.  
5. Interpretation  
In these Regulations, unless the context otherwise requires:  
‘Act’ means the  National Environment Act, 1995, Cap 153   
‘air pollution’  means any change in the composition of the air caused by smoke, soot, 
dust( in cluding fly ash), cinders, solid particles of any kind, gases, fumes, aerosols and 
odorous substances;  
‘ambient air’  means an outdoor air to which people, plants animals or material are in 
normal circumstances exposed;  
‘Authority’  means National Environmen t Management Authority;  
‘district ’ environment officer’  shall be an officer appointed under Section 15 of the 
National Environment Act  
‘emission limit’  means the highest permissible quantity of pollutants released into the 
air from a pollution source, expr essed as the concentration of pollutants in relation to 
one unit of production or to the degree of air pollution caused by such sources;  
‘emission’  means any emission or entrainment process emanating from a point, non 
point, or mobile source that result in  air pollution;  
‘environment’  has the meaning assigned to it under Section 1 of the National 
Environment Act;  
‘green house gas’  means gaseous constituents of the atmosphere, both natural and 
anthropogenic, that absorb and re -emit infrared radiation and inc ludes carbondioxide, 
methane and nitrous oxide;  
‘licensing authority’  means the Authority referred to in Section 6 or 10(2), responsible 
for implementing the licensing system under Part VI of the National Environment Act  
‘Minister’  means has the meaning a ssigned to it under Section 1 of the National 
Environment Act;  
‘mobile source’  means a single identifiable source of atmospheric emission which does  
6 
 not emanate from a fixed location;  
‘non -point source’  means a source of atmospheric emissions which cannot be identified 
as having emanated from a single identifiable source or fixed location, and includes 
veld, forest and open fires, mining activities, agricultural activities and stockpiles;  
‘objectionable matter’  means smoke, ash (including flashy), cinders, solid particles of 
any kind of particulates, gases including noxious or offensive gases, vapours, fumes, 
mist, grit, dust, radioactive substance which are generated as a result of combustion of 
fuel and the like, or a result of the use of electricity as a heat source or other matter 
capable of being dispersed or suspended in the atmosphere which is produced or is likely 
to be produced by any industrial process.  
‘ozone depleting substance’  means a substance having chemical or physical properties 
which, by it s release into the atmosphere can cause a depletion of the stratospheric 
ozone layer;  
‘point source’  means a single identifiable source and fixed location of atmospheric 
emission and includes smoke stacks and residential chimneys;  
‘polluting activity’  mean s any activity that does not comply with the standards 
prescribed under these regulations for which prior grant of a pollution licence by the 
Authority is mandatory;  
‘pollution licence’  has the meaning assigned to it under Section 58 of the National 
Enviro nment Act;  
‘pollution’  has the meaning assigned to it under Section 1 of the National Environment 
Act; 
‘premises’  has the meaning assigned to it under Section 1 of the National Environment 
Act; 
‘prescribed standard’  means any standard specified in any of t he Schedules to these 
Regulations.  
‘standard’  has the meaning assigned to it under Section 1 of the National Environment 
Act. 
‘smoke’   includes soot, ash, grit, and gritty particles emitted in smoke.  
 
PART II —INDUSTRIAL FACILITIE S ADJACENT TO RESIDE NTIAL AREAS  
 
6. Industrial  lay outs  
(1) Each district shall – 
(a) designate industrial layouts which shall be separate from  residential areas; and  
(b) provide buffer zones between industrial layouts and residential areas . 
(2) A buffer zone shall - 
(a) be rigidly kept away from deve lopers;  
(b) be monitored to prevent developing encroachment by developers.  
7. Industrial use  
 Except with the prior written approval of the Authority any new plant, equipment or   
7 
 industrial facility  that is capable of causing or involving the emission into the  
atmosphere of objectionable matter  shall not be installed within premises of the 
following class: - 
(a) the premises situated within an area designated as a residential zone 
having clearly demarcated boundaries as defined and which appear in the 
local physical  development plans prepared by the appropriate planning 
Authority under Part IV of the Physical Planning Act, 2010;  
(b) in the absence of such local plan described in (a) above, the premises 
shall mean such premises situated within a housing estate or situated  
within 1000metres of the nearest dwelling house of the housing estate.  
 
 
8. Interpretation of local physical development plan  
For the purpose of regulation 7, ‘local physical development plan’ has the same meaning 
assigned to it in the Physical Planning Act, 2010.  
 
9.  Refusal of approval  
(1) The Authority may refuse approval for such new installation in the premises 
described in regulation 7 if in its opinion such plant, equipment or facility will cause 
pollution.  
(2) Where the Authority grants permissi on for the plant, equipment or facility under 
paragraph (1) it may impose conditions on such approval.  
 
PART III —COMPLIANCE WITH AIR QUALITY STANDARDS  
10  Compliance with standards  
(1) Every person shall be required to comply with the minimum air quality stand ards 
prescribed in these regulations.  
(2) Unless otherwise prescribed elsewhere in these regulations for a particular trade, 
industry or process, the permissible limits of concentration or air impurities in 
the conduct of any trade, industry or process or the  operation of any burning 
equipment or industrial plant shall be as set out in the First Schedule  to these 
regulations .   
(3) Where it is necessary for the effective implementation of laws the Minister shall 
identify and allow the continued operation of existi ng air quality standards made 
under other written laws.   
8 
 11. Prohibition  
(1) No person shall emit or release any objectionable matter into the  air unless such 
emission or release is permitted by these regulations.  
(2) A person who releases any objectionable matter into the air contrary to these 
regulations commits an offence.  
(3) The Authority shall prevent any industry or facility from commencing  operation  
where the Authority believes such industry or facility may constitute a new 
source of  air pollution.   
9 
  
12. Permis sible emission limits  
Any person who undertakes an activity likely to pollute the air  shall be required to 
comply with the highest permissible quantity of emission of sulphur oxides, carbon 
monoxide, hydrocarbon as total organic carbon, dust, nitrogen oxi des or lead released 
into the atmosphere from a pollution source and respective test methods prescribed 
under the Second  Schedule  to these Regulations   
PART IV - RESTRICTION ON EMISSION FROM CERTAIN ACTIVITIES   
13.   Burning of waste  
(1) No owner or occupi er of industrial or trade premises, shall burn or cause to be burn t 
waste except in an incinerator of such type and design approved by the Authority.  
14. Erection of incinerators  
No person shall erect, construct, install, resite or alter any incinerator w ithout prior 
written approval from the Authority.  
15. Accompanying documents  
An application for approval to erect, construct, install, resite or alter any incinerator shall 
be accompanied by  
(a) site plans of the approved scale indicating clearly the location  of the proposed 
incinerator and buildings within 1000metres of the proposed incinerator;  
(b) proposed construction drawings of the incinerator, method of charging and 
control equipment and calculations and design parameters prepared by a 
qualified engineer; a nd  
(c) type and quantity of waste to be disposed of in the incinerator and if so directed 
by the Authority, a combustion report on the waste sample certified by a 
qualified chemist.  
16. Conditions for approval  
Where in the opinion of the Authority an inciner ator is inadequate in design or 
construction, or is inefficient in operation or inadequately maintained, it may by notice 
in writing served upon the owner or occupier require him to: - 
(a) repair, alter or replace the incinerator;  
(b) terminate or suspend the use o f the incinerator for any period prescribed;  
(c) dispose of the waste in such manner as prescribed.   
10 
  
17. Open burning  
(1) No person shall carry out open burning without a licence issued under Section 58 
of the Act.   
(2) Notwithstanding the provisions of clause (1) a  person may cause, allow or permit 
open burning of any combustible material or refuse in compliance with the 
following paragraphs: - 
(a) open burning of leaves, tree branches or yard trimmings originating on 
the premises of private residences and is done betwee n 8.00a.m to 
6.00pm;  
(b) fires purposely set to agricultural lands for disease and pest control or 
fires set to carcasses of diseased animals and poultry or for agricultural 
practices;  
(c) fires set purposely for carrying out research into causes and control of 
fires, or for the instruction and training of public and industrial fire 
fighting personnel.  
18. Conditions for a licence  
(1) A licence for open burning may be granted if the Authority is satisfied that: - 
(a) open burning is the only economically practicable met hod of disposal; and  
(b) such open burning is not likely to cause pollution  
(3) Every application for a licence to carry out open burning shall be in a form 
prescribed by the Authority and be accompanied by a sample of the material 
proposed to be burnt and a comb ustion report certified by a qualified chemist.  
19. Burning of Tyres  
No person shall burn tyres without the prior written approval of the Authority.  
20. Burning of Oil  
(1) No person shall burn oil in open air.  
(2) Notwithstanding the provisions of clause (1) abo ve, a person may burn oil if: - 
(a) the burning is for purposes of training firefighters  
(b) the burning is done by means of – 
i. flare; and  
ii. for the purpose of undertaking health and safety procedures in the 
petroleum exploration and production industry or the petroc hemical 
industry; and  
iii. expressly allowed by a resource agent.   
11 
 (3) For the avoidance of doubt clause (1) does not apply if a discharge from the 
burning of oil is directed to the open air by a stack, chimney or exhaust  pipe ( 
for example emissions from a motor  vehicle) . 
21. Cement factories  
In any trade, industry or process where cement is manufactured or which cement clinker 
is ground or cement packed, the emissions into the air shall be as prescribed in the Third  
Schedule to these Regulations.  
22. Motor Vehi cles and Motor cycles  
(1)Every motor vehicle (other  than a motor cycle or scooter) to be  imported or  registered 
on or after the coming into force of these regulations shall conform  to the standard of 
exhaust emission specified in the  Fourth  Schedule  to the se Regulations .   
(2) Every motor cycle to be imported or registered on or after the coming into force of 
these regulations shall conform to the standard of exhaust emission specified in the Fifth 
Schedule to these Regulations.  
23. Permissible dark smoke l imits for new facilities  
(1) The occupier of any industrial or trade premises shall not cause, suffer, allow or 
permit smoke emissions of any colour from any new facility except fuel burning 
equipment utilising solid fuel and including but not limited to any chimney which 
appears to the Authority or any authorised officer  
(a) to be darker  than that prescribed in the Sixth  Schedule  to these regulations or  
(b) when observed or recorded with such instrument or device as the Authority may 
approve to be darker than that prescribed in the Sixth  Schedule  to these 
regulations  
(c) to be of such capacity as to cause obstruction to a degree equivalent to smoke 
darker than that prescribed in Sixth  Schedule  to  these regulations . 
(2) For fuel burning equipment utilising solid fu el, the permissible limit shall be as 
prescribed in these regulations.  
24. Permissible dark smoke limits for existing facilities  
(1)For existing facilities, the permissible limit shall be that prescribed in the Seventh  
Schedule to these regulations.  
(2) E very occupier of existing facility emitting smoke shall comply with the requirement 
of paragraph (1) within 24 months from the coming into force of these Regulations.  
25. Exceptions   
12 
 Regulations 2 3and 2 4 shall not apply to the emission of smoke from an in stallation for 
an aggregate of less than 15 minutes in  any period of one hour provided that the total 
period of such emissions shall not exceed  an aggregate of  25minutes  in any period of 
twenty four hours .  
26. Water vapour  
Where the presence of water vapo ur is the only reason for failure of an emission to meet 
the prescribed standard specified in these regulations, these requirements shall not apply 
provided that the occupier of the premises has obtained prior written approval from the 
Authority for permis sion to discharge the same.  
27. Occupier to test and keep records  
The occupier of such premises shall, if so required by the Authority, install, operate, 
maintain and calibrate one or more approved smoke density equipment and recorders as 
may be determine d by the Authority, and to keep records of volume and density of 
smoke generated for inspection by the Authority.  
28. Indoor air pollution.  
(1) Any activity that causes indoor air pollution is prohibited.  
(2) Notwithstanding the provisions of sub section ( 1) above, indoor air pollution may be 
accepted if it meets the standards set forth in the Eighth schedule to these regulations.  
  
13 
  
PART V - AIR QUALITY MANAGEMENT AND MONITORING  
28: Air quality management plan  
(1) Each lead agency or district body or commit tee responsible for environmental 
management in  terms of Part VII of the National Environment Act shall develop an air 
quality management plan.  
(2) Each district shall include in its district physical development plan contemplated in 
Part IV of the Physica l Planning Act, an air quality management plan.  
29. Contents of air quality management plans  
An air quality management plan shall - 
(a) within the domain of the relevant lead agency, district or municipality seek - 
i. to improve air quality;  
ii. to identify and red uce the negative impact on health and the environment of poor 
air quality;  
iii. to address the effects of emissions from the use of fossil fuels in residential areas;   
iv. to address the effects of emissions from industrial sources;  
v. to address the effects of emissi ons from industrial sources;  
vi. to address the effects of emissions from any point or non point source of air 
pollution other than those contemplated in paragraphs (ii) and (iii);  
vii. to implement the country’s obligations in respect of international and regional  
agreements; and  
viii. to give effect to the best practice of air quality management . 
(b) describe how the relevant lead agency, district or municipality will give effect to its 
air quality management plan; and  
(c) comply with other requirements as may be presc ribed by the Minister.  
30. Reporting on implementation of air quality management plan  
Each lead agency  or district shall submit an annual air quality management report 
including information on - 
(a) air quality management initiatives undertaken by it during th e reporting period;  
(b) the level of its compliance with the air quality standards  
(c) measures taken by it to secure compliance with those standards  and  
(d) its air quality monitoring activities   
14 
  
31. Air quality monitoring  
(1) The Authority or a district environme nt officer may require any person to undertake 
an air quality monitoring programme as contemplated in regulation 30(2) if - 
(a) the Authority  or district environment officer reasonably suspects that the person 
has on one or more occasions contravened any of the  provisions in these 
regulations  
(b) the activity being conducted by the person requires an air quality management 
plan.  
(2) An air quality monitoring programme includes the implementation of all reasonable 
measures required to effectively measure, report and  verify compliance or non 
compliance with these regulations to the satisfaction of the Authority or district 
environment officer as the case may be.  
PART VI - OFFENCES AND PENALTIES  
32. Offences  and penalties  
(1) Any person who emits or discharges object ionable matter without a li cence issued 
under section 58(4)  of the Act shall be guilty of an offence and shall be liable  to a fine 
not exceeding one thousand currency points or to a term of imprisonment not exceeding 
five years or to both and to a further fine of two thousand currency points  for every day 
that the offence is continued after a notice by the Authority requiring him to cease the 
act specified therein has been served upon him.  
(2) Any omission or neglect to comply with, or an act done contrary to any of the 
provisions of these Regulations other than in paragraph (1) shall be an offence and the 
offender shall on conviction be liable to a fine not exceeding  eight hundred currency 
points  or a term of imprisonment not exceeding one year or to both.  
 
 
 
 
  
15 
  
SCHEDULE  1       Regulation 10  
 
A. PERMISSIBLE EMISSION LIMITS FOR CRITERIA AIR POLLUTANTS  
 
Pollutant  Standard For 
Ambient Air  Standard For 
Emissions  (Point 
Sources)  Averaging Time 
For Ambient Air  Analytical method  
Acid mist  100 µgNm-3 10.0 mg/m3 HBr;  
5.0 mg/m3 HNO 3;  
1.0 mg/m3 H3PO 4; 
1.0 mg/m3 H2SO 4 10 hr   Ion Chromatography  
Ammonia  200 µgNm-3 50 mg/Nm3  24 hr  Chemiluminescence  
Asbestos  0.01 fibres ml-
1 0.01 fibres ml-1 24 hr  Atomic absorption 
spectrometry  
(AAS), X -ray 
fluorescence or 
Induct ively coupled 
plasma (ICP)  
Baggase  200µNgm-3  24 hr   
Ceramics  200 µgNm-3  24 hr   
Chlorine  1.45 mg/m3  3.0 mg/m3 () 
 24 hr  Residual chlorine 
electrode  
Cobalt  3 μg/m3 6.0 μg/m3 1 month  Atomic absorption 
spectrometry  
(AAS), X -ray 
fluorescence or 
Inductively coupled 
plasma (ICP)  
Coffee dust  200 µg Nm-3 15 mg/m3  24 hr  Respirable  particulate  
matter  sampler -X-ray 
techniques  
Cotton 
fibres  200 µgNm-3 15 mg/m3  24 hr Respirable  particulate  
matter  sampler -X-ray 
techniques  
Copper dust  1.0 µgNm-3 0.5 mg/Nm3 1 month  Atomic absorption 
spectrometry  
(AAS), or Inductively 
coupled plasma (ICP)  
Electrode 
manufacture 
emissions  150 µgNm-3 20 mg/Nm3 24 hr  Potentiometer, 
Coulometer or 
polarography  
 
 
 
Hydrogen 
Sulphide  (15 mg/m3)  
 15 mg/Nm3 24hr Chromatographic 
Analysis  
     
Lime  200 µgNm-3 15 mg/m3 24 hr  Gravimetric analysis or  
16 
  X-ray techniques  
Ozone  120 μg/m3  
 
180 μg/m3 120 μg/m3 
 
120 μg/m3 8 hr 
 
8 hr Ion chromatography 
using UV -VIS detector 
or conductivity detector  
Phosphates  200 µgNm-3 50 mg/Nm3 24 hr  ion chromatography or 
UV spectroscopy  
Silica  200 µgNm-3 0.05 mg/m3 24 hr  X-ray diffraction 
(XRD) 
Environmen
tal tobacco 
smoke 
(ETS)  0.1µg/m3 0.0 µg/m3 Not to exceed 5 
min. in any one 
hour HPLC methods 
nicotine in air, surface, 
and dust samples as a 
marker for ETS 
exposure  
Soot  500 µgN m-3  24 hr  -Visual Estimation 
Technique (VAE)  
-Gravimetric m ethod  
-Counting technique  
Synthetic 
fibres  0.01fibres ml-1   24 hr  Phase Contrast 
Microscopy (PCM)  
Tea dust  200 µgNm-3  24 hr  Respirable  particulate  
matter  sampler -X-ray 
techniques  
Tobacco 
dust 200µgN m-3  24 hr  Respirable  particulate  
matter  sampler -X-ray 
techniques  
Particulate 
matter  
PM 10  
 100 µg m-3 
 
60 µg m-3 100 µg m-3 
 
60 µg m-3 24 hr  
 
1 year  -x-ray analysis  
-Tapered Element 
Oscillating 
Microbalance (TEOM)  
- Gravimetric  
 
Particulate 
matter  
PM 2.5  
 60 µg m-3 
 
40 µg m-3 60 µg m-3 
 
40 µg m-3 24 hr  
 
1 year  =Gravimetric  
-x-ray analysis  
-Tapered Element 
Oscillating 
Microbalance (TEOM)  
 
Wood dust  1 mgNm-3 20mg/Nm3 24 hr  Respirable  particulate  
matter  sampler -X-ray 
techniques  
VOCs  6 mgNm-3 20mg/Nm3 24 hr  Chromatography 
(GC/HPLC)  
 
  
17 
  
B. PERMISSIBLE EM ISSION LIMITS FOR HYDROCARBONS  
Analytical Method: HPLC, GC -(FID, NPD, MS)  
CHEMICAL NAME  CAS  TWA  STEL  Remarks  
  ppm  mg m-3  ppm  mg m-3   
1,1-Dichloroethane  75-34-3 200 810 250 1010   
1,1-Dichloro -1-nitroethane  594-72-
9 2 12 10 60  
1,1-Difluoromethane 
F152a)   1000  4950     
1,1-Dimethylhydrazine  57-14-7 0.01 0.015    carcinogen  
1,2-Dichloroethylene  540-59-
0 200 790 250 1000   
1,1,1 -Trichloroethane  71-55-6 350 1900  450 2450   
1,1,2 -Trichloroethane  79-00-5 10 45 20 90 carcinogen  
1,1,1,2 -Tetrachloroethane  630-20-
6 1 7   Handle  
1,1,2,2 -Tetrachloroethane  79-34-5 1 7   carcinogen  
1,1,1,2 -
Tetrachlorodifluoroethane   500 4170     
1,2-Dibromo -3-
chloropropane (DBCP)  96-12-8 0.001     carcinogen  
1,2-Dibromoethane  106-93-
4     PIC 
1,2,3 -Trichloronaphthalene  1321 -
65-9  5  10  
1,2,3 -Trichloropropane  96-18-4 10 60    
1,2,3 -Trimethylbenzene  526-73-
8 25 125 35 170  
1,2,4 -Trimethylbenzene  95-63-6 25 125 35 170  
1,3,5 -Trimethylbenzene  108-67-
8 25 125 35 170  
1,3-Dichloro -5,5-
dimethylhydantoin  118-52-
5 0.2 0.4    
1,3-Dichloropropene  542-75-
6 1 5 10 50 carcinogen  
1,4-Benzoquinone  106-51-
4 0.1  0.3   
1,4-Diamino -2-
nitrobenzene  5307 -
14-2      
1,4-Diaminobenzene    0.1    
1,4-Dichloro -2-butene  110-57-
6 0.005      
1,4-Dioxane  123-9-1 25  100   
1-Chloro -1-nitropropane  600-25-
9 2 10    
2-isopropoxyethanol  109-59-
1 25 105 75 320  
2,5-Diaminotoluene 615-50-       
18 
 sulphate  9 
2,6-Di-tert-butyl -p-cresol    10  20  
2-Aminopyridine  504-29-
0 0.5 2 2 8  
2-Butoxyethyl acetate  112-07-
2 5 33    
2-Chloro -6-
trichloromethylpyridine    10 
(total)  
5 
(resp.)     
2-N-Dibutylaminoethanol  102-81-
8 2 14    
2-Diethylaminoethanol  100-37-
8 10 50    
2-Hydroxypropylacrylate  999-61-
1 0.5 3    
4-tert-Butylcatechol  98-29-3  5    
4-Methoxyphenol  150-76-
5  5    
4,4'-Methylene bis(2 -
chloroaniline)  101-14-
4 0.02 0.22   carcinogen  
4,4'-Methylene dianiline  101-77-
9 0.1 0.8 0.5 4 carcinogen  
4,4'-Thiobis(6 -tertbutyl -m-
cresol)  96-69-5  10 
(total)     
5-Methyl -3-heptanone  541-85-
5 25 130    
Acetaldehyde  75-07-0 150 180  270  
Acetic acid  64-19-7 10  15   
Acetic anhydride  108-24-
7 5     
Acetone  67-64-1 500     
Acetone cyanohydrin  75-86-5 2     
Acetonitrile  75-05-8 40 70 60 105  
Acetophenone  98-86-2 10     
Acetyl chloride  75-36-5  3    
Acetylene  74-86-2 2500  2662     
Acetylene tetrabromide  79-27-6 1 15 1.5 20  
Acetyl salicylic acid (ASA)  50-78-2  5    
Acrolein  107-02-
8 0.1  0.3   
Acrylamide  79-06-1 0.03 0.06   carcinogen  
Acrylic acid  79-10-7 2 6    
Acrylonitirle  107-13-
1 2 4.5    
Adipic acid  124-04-
9  5    
Adiponitrile  111-69-
3 2     
       
Allyl alcohol  107-18-
6 2  4    
19 
 Allyl bromide  106-95-
6      
Allyl chloride  107-05-
1 1 3 2 6  
Allyl glycidyl ether (AGE)  106-92-
3 5 22 10 44  
Allyl isothiocyanate  57-06-7 1     
Allyl propyl disulphide  2179 -
59-1 3 12 3 18  
Amitrole  61-82-5  0.2    
Ammon ia 7664 -
41-7 25 18 35 27  
Ammonium chloride fumes  12125 -
02-9  10  20  
Ammonium sulphamate  7773 -
06-0  10 
(total)  
5 
(resp.)     
n-Amyl acetate  628-63-
7 100 525    
sec-Amyl acetate  626-38-
0 125 670 150 800  
Aniline and homologues  62-53-3 2  5   
o-Anisidi ne 90-04-0 0.1 0.5   carcinogen  
p-Anisidine  104-94-
9 0.1 0.5   carcinogen  
Azinphos -methyl  86-50-0  0.2  0.6  
Benomyl  17804 -
35-2 0.8 
(total) 
1.3 
(resp)  10 
(total)  
 5 
(resp)     
Benzaldehyde  100-52-
7 2     
Benzene  71-43-2 5 16    
Benzenethiol  108-98-
5   0.1 0.5 carcinogen  
Benzidine  92-87-5  0.01    
Benzoyl chloride  98-88-4 1 5    
Benzoyl peroxide  94-36-0  5    
Benzonitrile  100-47-
0      
Benzophenone  119-61-
9  5    
Benzyl acetate  140-11-
4 10     
Benzyl alcohol  100-51-
6 10     
Benzyl chloride  100-44-
7   1 5  
Benzylamine  100-46-
9      
Bromoethane  74-96-4 5 22     
20 
 Bromoform  75-25-2 0.5 5    
Bromomethane  74-83-9 5 20    
Buta -1,3-diene  106-99-
0 1000  2200     
n-butylalcohol  71-36-3 50 150    
Butan -2-ol (sec)  78-92-2 100 300 150 450  
butyl alcohol  75-65-0 100 300 150 450  
Butane  106-97-
8 800 1900     
Butan -2-one (MEK)  78-93-3 200 590 300 885  
Butoxyethanol  111-76-
2 25 120    
n-Butyl acetate  123-86-
4 150 710 200 950  
Butyl acetate (sec)  105-46-
4 200 950    
Butyl acetate (tert)  540-88-
5 200 950    
Butyl acrylate  141-32-
2 10 55    
Butyl amine  109-73-
9 5 15    
sec-Butylamine  13592 -
84-6      
Butyl chromate (tert) - as 
CrO6  1189 -
85-1  0.001    carcinogen  
n-Butyl glycidyl ether 
(BGE)  2426 -
08-6 25 135    
n-Butyl lactate  138-22-
7 5 25    
n-Butyl me rceptan (Butane 
thiol)  109-79-
5 0.5 1.5    
tert-Butyl peroxide  110-05-
4 0.5 5    
o-sec-Butylphenol  89-72-5 5 30    
p-tert-Butyltoluene  98-51-1 10 60 20 120  
Butyric acid  107-92-
6  15    
Butyric anhydride  106-31-
0  5    
n-Butryonitrile  109-74-
0 8 22    
Camphene  5794 -
03-6  2    
Camphor (synthetic)  76-22-2  2    
Caprolactam (dust & 
aerosol)  105-60-
2  1  3  
Caprolactam (vapour)   4  8   
Captan  133-06-
2  5    
Caravey        
Carbon blacks as  (PAHs)    0.1     
21 
 Chloral and chloral hydrate    5    
Chlorin e 7782 -
50-5 1 3 3 9  
Chlorine dioxide  10049 -
04-4 0.1 0.3 0.3 0.9  
Chlorine trifluoride  7790 -
91-2 0.1 0.4    
Chloroacetaldehyde  107-20-
0 1 3    
Chloroacetic acid  79-11-8  1    
Chloroacetophenone (tear 
gas) 532-27-
4 0.05 0.3    
Chloroacetyl chloride  79-04-9 0.05 0.2 0.15 0.7  
Chlorobenzene  108-90-
7 10 50    
o-Chlorobenzylidene  2698 -
41-1 0.05 0.4    
Chlorobromomethane  74-97-5 200 1050     
Chlorodifluoromethane (F -
22) 75-45-6 1000  3500  1250  4375   
Chlorodiphenyl (42% 
chlorine)  53449 -
21-9  1   carcinog en 
Chlorodiphenyl (54% 
chlorine)  11097 -
69-1  0.5    
Chloroethane  75-00-3 100 260   carcinogen  
Chloroform  67-66-3 10 50 50 225 carcinogen  
bis-Chloromethyl ether  542-88-
1 0.001  0.005    carcinogen  
Chloromethyl ethyl ether  107-30-
2     carcinogen  
Chlorop entafluoroethane 
(F115)  76-15-3 1000  6320     
Chloropicrin  76-06-2 0.1 0.7 0.3 2  
o-Chloroprene  126-99-
8 10 45 1 3.6 carcinogen  
o-Chlorostyrene  2039 -
87-4 50 285 75 435  
o-Chlorotoluene  95-49-8 50 250 75 375  
Chlorotrifluoroethylene 
(CTFE)  79-38-9      
Coumarin  91-64-5  10 
(total)   
5 (resp)     
o-Cresol  95-48-7 2.3 10    
m-Cresol  108-39-
4 2.3 10    
p-Cresol  106-44-
5 2.3 10    
Crocidolite  1 2001 -
28-4     PIC 
Crotonaldehyde  4170 -
30-3 2 6 6 18   
22 
 Crufomate  299-86-
5  5  20  
Cumene  98-82-8 50 245 75 365  
Cyanamide  420-04-
2  2    
Cyanide as (CN)    5    
Cyanogen  460-19-
5 10 20    
Cyanogen chloride  506-77-
4 0.3 0.6    
Cyclohexane  110-82-
7 300 1050  375 1300   
Cyclohexanethiol  1569 -
69-3   0.5 2.4  
Cyclohexanol  108-93-
0 50 200    
Cyclohexene  110-83-
8 300 1015     
Cyclohexanone  108-94-
1 25 100    
Cyclohexylamine  108-91-
8 10 40    
Cyclonite  121-82-
4  1.5  3  
Cyclopentadiene  542-92-
7 75 200 150 400  
Cyclopentane  287-92-
3 600 1720  900 2580   
Cyclopropane  75-19-4  400    
Cyhexatin (as SN)  13121 -
70-5  5  10  
Cyluthrin    0.1    
Cysteine  3374 -
22-9      
Dalapon   1 6    
Decaborane  17702 -
41-9 0.05 0.3 0.15 0.9  
Decalin  493-01-
6  100    
Decane -1-thiol 143-10-
2   0.5 3.6  
Demeton  8065 -
48-3 0.01 0.11    
Demeton -S-methyl    0.5  1.5  
Diacetone alcohol  123-42-
2 50 240 75 960  
Di-allate        
Diallylamine  124-02-
7 1     
o-Dianisidine  119-90-
4     carcinogen  
Diazomethane  334-88- 0.2 0.4     
23 
 3 
Diborane  19287 -
45-7 0.1 0.1    
Dibutylamine  111-92-
2 5     
Dibutylamine phosphate  107-66-
4 1 5 2 10  
Dibutyl phos phite  1809 -
19-4 1 8.6 2 17  
Dibutyl phenyl phosphate  2528 -
36-1 0.3 3.5    
Dibutyl phthalate (dsp)  84-74-2  5  10  
Dichloroacetic acid  79-43-6    4  
Dichloroacetylene  7572 -
29-4 0.1 0.4   carcinogen  
o-Dichlorobenzene  95-50-1 50 300    
p-Dichlorobenzene  106-46-
7 75 450 110 675 carcinogen  
Dichloroethyl ether  111-44-
4 5 30 10 60 carcinogen  
Dichlorofluoromethane 
(F12)  75-71-8 1000  4950  1250  6200   
Dichloromethane  75-09-2 50 174   carcinogen  
Dichlorofluoromethane 
(F21)  75-43-4 10 40    
Dichloropropane  78-87-5  10    
Dichloropropene  542-75-
6 1 5 10 50  
Dichlorotetrafluoroethane 
(F-114) 76-14-2 1000  7000     
Dicrotophos  141-66-
2  0.25    
Dicyclopentadiene  77-73-6 5 30    
Dicyclopentadienyl iron 
(Ferrocene)  102-54-
5  10 
(total)  
5 (resp)     
Diethanolami ne 111-42-
2 3 15    
Diethylamine  109-89-
7 10 30 25 75  
Diethylenetriamine  111-40-
0 1 4    
Diethylene glycol (vapour 
and aerosol)  111-46-
6 50     
Diethylene glycol   10     
Diethylketone (DEK)  96-22-0 200 705    
Diethylphthalate (DEP)  84-66-2  5  10  
Difluorodibromomethane 
(F12B2)  75-61-6 100 860 150 1290   
Diglycyl ether (DGE)  2238 -
07-5 0.1 0.5    
Diisobutylene  107-39- 600      
24 
 1 
Diisobutyl ketone (DIBK)  108-83-
8 25 150    
Diisopropylamine (DIPA)  108-18-
9 5 20    
Dimethyl acetamide 
(DMAC)  127-19-
5 10 35 15 50  
Dimethylamine  124-40-
3 10 18    
Dimethylaminopropionitrile  1738 -
25-6     min. exposure  
N,N-Dimethylaniline  121-69-
7 5 25 10 50  
Dimethyl carbomoyl 
chloride  79-44-7     carcinogen  
Diethyl phosphate  300-76-
5  3  6  
Dimethyl ether  115-10-
6 500     
Dimethyl formamide  68-12-2 10 30 20 60  
Dimethylphthalate  131-11-
3  5  10  
Dimethylsulphate  77-78-1 0.1 0.5   carcinogen  
Diminozide        
Dinitolmide  148-01-
6  5  10  
Dinitrobenzene (o -, m-, p-
isomers)  o-528-
29-0 0.15 1 0.5 3  
Dinitrobenzene  m-99-
65-0      
Dinitrobenzene (o -, m-, p-
isomers)  p-100-
25-4      
Dinitro -o-cresol  534-52-
1  0.2  0.6  
Dinitrophenols    1    
Dinitrotoluene  121-14-
2  1.5   carcinogen  
Di-sec octyl phthalate  117-81-
7  5  10  
Diphenyl  92-52-4 0.2 1    
Diphenylamine  122-39-
4  5  10  
Dipropylene glycol methyl 
ether  34590 -
94-8 100 600 150 900  
Dipropyl ketone  123-19-
3 50 235    
Disulfiram  97-77-8  2  5  
Disulfoton  298-04-
4  0.1  0.3  
Dodecane -1-thiol 112-55-
0   0.5 4  
Enflurane  13838 -       
25 
 16-9 
Epichlorohydrin  106-89-
8 2 7.6   carcinogen  
Ethane  74-84-0      
Ethanol  46-17-5 100 1900     
Ethanolamine  141-43-
5 3 9 6 15  
Ethion  563-12-
2  0.4    
Ethoxyethan -2-ol 110-80-
5 5 18    
Ethoxyethylacetate  111-15-
9 5 27    
Ethyl acetate  141-78-
6 400 1400     
Ethyl acrylate  140-88-
5 5 20 25 100  
Ethyl amine  75-04-7 10 18    
Ethyl bromoethane   5 22    
Ethyl butyl ketone  106-35-
4 50 230 75 345  
Ethyl chloride  75-00-3 1000  2600  1250  3250  use cautiously  
Ethyl ether  60-29-7 400 1200  500 1500   
Ethylbenzene  100-41-
4 100 435 125 545  
Ethyl -p-nitrophenylbenzene 
thiono -  phosphonate (EPN)  2104 -
64-5  0.5  2  
Ethylene chlorohydrin  107-07-
3 1 3    
Ethylene diamine  107-15-
3 10 25    
Ethylene dibromide  106-93-
4 20    carcinogen  
Ethylene dichloride  107-06-
2 10 40   carcinogen  
Ethyl ene glycol  107-21-
1  60  120  
Ethylene glycol dinitrate  628-96-
6 0.02 0.1 0.05 1  
Ethylene imine  151-56-
4 0.5 1   carcinogen  
Ethylene oxide  75-21-8 1 2 5 10  
Ethylene thiourea  96-45-7     carcinogen  
Ethyl formate  109-94-
4 100 300 150 450  
Ethyledene benzene   5 25    
Ethyl mercaptan  75-08-1 0.5 1.3 2 3  
N-Ethylmorpholine  100-74-
3 5 24 20 95  
Ethyl silicate  78-10-4 10 85 30 255  
Fenitrothion  122-14-
5  1     
26 
 Fensulfotion  115-90-
2  0.1    
Ferbam  14484 -
64-1  10  15  
Ferrovanadium dust  12604 -
58-9  1  3  
Fibrous glass dust    15 (tot)  
5 (resp)     
Flufenoxuron        
Flumethrine        
Fluoroxene  406-90-
6 2 10.3    
Formaldehyde  50-00-0 1 1.2 2 2.5  
Paraformaldehyde  30525 -
89-4 1  2   
Formalin (aqueos 
formaldehyde)   1  2   
Formamide  75-12-7 10 15    
Formic acid  64-18-6 5 9 10 19  
Fosetyl -Al       
Freon -11 
(Fluorotrichloromethane)  75-69-4 1000  5600     
Fufural  98-01-1 5 20 15 60  
Fufuryl alcohol  98-00-0 10 40 15 60  
Gasoline  8006 -
61-9 300 900 500 1500   
Geraniol  106-24-
1      
Germanium tetrahydri de 7782 -
65-2 0.2 0.6 0.6 1.8  
Glutoraldehyde  111-30-
8 0.2 0.8    
Glycerine mist, glycerol  56-81-5  10 (tot)  
5 (resp)     
Glycidol  556-52-
5 25 75 100 300  
Glyconitrile  107-16-
4   2 5  
Hafnium  7440 -
58-6  0.5  0.15  
Halothane  151-67-
7 0.5 4 2 16  
n-Heptane 142-82-
5 400 1600  500 2000   
Heptane -1-thiol 1639 -
09-4   0.5 2.7  
n-Hexane  110-54-
3 50 180 62.5 225  
Hexane isomers (excl. n -
hexane)   500 1800  1000  3600   
Hexachlorobutadiene  76-68-3 0.02 0.24   warning 
unknown   
27 
 Hexachlorocyclopentadiene  77-47-4 0.01 0.1 0.03 0.3 Poor warning  
Hexachloroethane  67-72-1 1 10   carcinogen  
Hexachloronaphthalene  1335 -
87-1  0.2  0.6  
Hexadecane -1-thiol 2917 -
26-2   0.5 5.3  
Hexafluoroacetone  684-16-
2 0.1 0.7 0.3 2  
Hexamethylene 
diisocyanate  822-06-
0 0.005  0.035     
Hexamethylphosphoramide  680-31-
9     carcinogen  
n-Hexanethiol  111-31-
9   0.5 2.7  
Hexan -2-one (MBK)  591-78-
6 5 20    
Hexone  108-10-
1 50 205 75 300  
sec-Hexylacetate  142-92-
7 500 300    
Hexylene glycol  107-41-
5 25 125    
Hydrazine  302-01-
2 0.01 0.013    carcinogen  
Hydrogenated terphenyls  92-94-4 0.5 5    
Hydrogen bromide  10035 -
10-6 3 10    
Hydroquinone  123-31-
9  2  4  
Indene  95-13-6 10 45 15 70  
Indium and compounds  7440 -
74-6  0.1  0.3  
Iodine  7553 -
56-2 0.1 1    
Iodoform  75-47-8 0.6 10 1 20  
Isoamyl acetate  123-92-
2 100 525 125 655  
Isoamyl alcohol (primary)  123-51-
3 100 360 125 450  
Isoamyl alcohol 
(secondary)  528-75-
4 100 360 125 450  
Isobutane  75-28-5 800 1800     
Isobutyl acetate  110-19-
0 150 700 187 875  
Isobutyl alcohol  78-83-1 50 150 75 225  
Isobutryonitrile  78-82-0 8 22    
Isocyanates (as NCO)    0.02  0.07  
Isooctyl alcohol  26952 -
23-6 50 270    
Isophorone  78-59-1 5 25    
Isophorone diisocyanate  4098 -
71-6 0.005  0.045  0.02 0.18   
28 
        
Isopropyl acetate  108-21-
4 250 1040  310 1290   
Isopropyl alcohol  67-63-0 400 980 500 1225   
Isopropylamine  75-31-0 5 12 10 24  
N-isopropylaniline  768-52-
5 2 10 10 25  
Isopropyl ether  108-20-
3 250 1050  310 1320   
Isopropyl glycidyl ether 
(IGE)  4016 -
14-2 50 240 75 360  
Isovaleric acid  503-74-
2      
Kerosene  8008 -
20-6  200    
Kepone  143-50-
0  0.001    carcinogen  
Ketene  463-51-
4 0.5 0.9 1.5 3  
Linalool  78-70-6      
Linalyl acetate  115-95-
7      
Lindane (see BHC gamma)  58-89-9     PIC 
Lithium fluoride  7789 -
24-4  2.5    
Lithium hydride  7580 -
67-8  0.025    
Lithium hydroxide  1310 -
66-3  1    
Lithium oxide  12057 -
24-8  1    
Loxynil        
LPG   1000  1800  1250  2250   
Malonitrile  109-77-
3 3 8    
Mercury (organo -alkyl 
compounds)    0.01 0.04  PIC 
Mercury (aryl compounds)    0.1    
Mesityl oxide  141-79-
7 15 60 25 100  
Methacrylic acid  79-41-4 20 70    
Methanol  67-56-1 200 260 250 325  
Methomyl  16752 -
77-5  2.5   PIC 
Methoxyflurane   2 13.5    
Methyl acetate  79-20-9 200 610 250 760  
Methyl acrylate  96-33-3 10 35    
Methyl acrylonitrite  126-98-
7 1 3 2 6  
Methyl anthranilate  134-20-
3      
Methyl bromide  74-83-9 5 20 15 60 carcinogen/PIC   
29 
 Methyl acetylene -
propanediene mixture   1000  1800  1250  2250   
Methyl cellosolve  109-86-
4 5 16 7 24  
Methyl cellosolve acetate  110-49-
6 5 16 7 24  
Methyl chloroform  71-55-6 350 1900  450 2450   
Methyl chloride  74-87-3 50 105 100 205 carcinogen  
Methyl -2-cyanoacrylate   2 9 4 18  
Methylcyclohexane  108-87-
2 400 1600  500 2000   
Methylcyclohexanol  590-67-
0 50 235 75 350  
o-Methylcyclohexanone  583-60-
8 50 230 75 345  
      tricarbonyl  12108 -
13-3  0.2  0.6  
Methyl demeton  8022 -
00-2  0.5  1.5  
Methylene bis(4 -
cyclohexylisocyanate)   0.005  0.05    
Methylene 
bisphenylisocyanate  101-68-
8 0.005  0.05 0.02 0.2  
Methyl ethylketone 
peroxide  1338 -
23-4 0.2 1.5    
Methyl formate  107-31-
3 100 250 150 273  
Methyl hydrazine  60-34-4 0.2 0.35   carcinogen  
Methyl iodide  74-88-4 2 12 5 30 carcinogen  
Methyl isoamyl ketone  110-12-
3 50 240    
Methyl isobutyl carbinol  105-30-
6 25 100 40 165  
Methyl isopropyl ketone  563-80-
4 200 705    
o-Methyl styrene  98-83-9 50 240 100 485  
Methyl mercaptan  74-93-1 0.5 1    
Methyl methacrylate  80-62-6 100 410 125 510  
       
Methyl silicate  681-84-
5 1 6 5 30  
Methylal  109-87-
5 1000  3100  1250  3875   
Methylamine  74-89-5 10 13    
Methyl n -amyl ketone  110-43-
0 50 235 100 465  
Metolachlor    5 (resp)     
Metsulfuron -methyl        
Mica (containing less than 
1% quartz)  12001 -
26-2  3 
(resp.)     
Monoethanolamine  141-43-
5 3 6 6 15   
30 
 Monolinuron        
Monomethyl aniline  100-61-
8  0.5  2  
Morpholine  110-91-
8 20 70 30 105  
N,N-dimethyl -para-
phenylenediamine  99-98-9      
N-Nitrosodiethanolamine  1116 -
54-7      
N-Phenyl -para-
phenylenediamine  01-54-2      
Naled  300-76-
5  3  6  
Napropamide        
Naptha (coal tar)  8030 -
30-6 100 400    
Naphthalene  91-20-3 10 50 15 75  
Naphthalene diisocyanate  3173 -
72-6 0.05 0.04 0.02 0.17  
o-Naphthylamine  134-32-
7  0.01   carcinogen  
o-Naphthylamine  91-59-8  0.01   carcinogen  
Nicotine  54-11-5  0.5  1.5  
Nimrod        
Nitrapyrin  1929 -
82-4  10  20  
p-Nitroaniline  100-01-
6  3    
Nitrobenzene  98-95-3 1 5 2 10  
p-Nitrochlorobenzene  100-00-
5  1  2 carcinogen  
Nitroethane  79-24-3 100 310 150 465  
Nitroglycerine  55-63-0 0.05 0.5    
Nitromethane  75-52-5 100 250 150 375  
1-Nitropropane  108-03-
2 25 90    
2-Nitropropane  79-46-9 25 90 35 135  
N-Nitrosodimethylamine  62-75-9     carcinogen  
o-Nitrotoluene  88-72-2 2 11    
m-Nitrotoluene  99-08-1 2 11    
p-Nitrotoluene  99-99-0 2 11    
Nitrotrichloromethane  76-06-2 0.1 0.7 0.3 2  
Nonane  111-84-
2 200 1050  250 1300   
Nonan -2-one 821-55-
6      
Octachloronaphthalene  2234 -
13-1  0.1  0.3  
n-Octane  111-65-
9 300 1450  375 1800   
Octane -1-thiol 111-88-
6   0.5 6   
31 
 Octan -1-ol 111-87-
5 50     
Octaldehyde (Octanol)  124-13-
0      
Oil mist  8012 -
95-1  5  10  
Oleyl alcohol  143-28-
2      
o-phenyl ph enol 90-43-7      
m-phenyl phenol  500-51-
8      
p-phenyl phenol  92-69-3      
Osmium tetraoxide  20816 -
12-0 0.0002  0.002  6E-04 0.06  
Oxadiazon        
Oxalic acid  144-62-
7  1  2  
p-phenylenediamine  106-50-
3  0.1   o-isomer  
o-phenylenediamine  95-54-5     carcinogen  
m-phenylediamine  108-45-
2      
Paraffin wax fume  8002 -
74-2  2  6  
PAHs (cyclohexane 
soluble)    0.1   carcinogen  
PAHs(benzene soluble)    0.2   carcinogen  
PCBs    0.5  1 PIC 
Pendimethalin        
Pentaborane  19624 -
22-7 0.05 0.01 0.15 0.03  
Pentachloroacetone  1768 -
31-6  0.5    
Pentachloroethane  76-01-7  30    
Pentachloroethylene   25     
Pentachloronaphthalene  1321 -
64-8  0.5  2  
Pentachloronitrobenzene  82-68-8  0.5    
Pentaerythiritol  115-77-
5  10 (tot)  
5 (resp)     
n-Pentane  109-66-
0 600 1800  750 2250   
Pentane -2,4-dione  600-14-
6      
Pentan -2-one 107-87-
9 200 700 250 880  
Pentanethiol (pentan -1-
thiol)  110-66-
7   0.5 2.1  
Perchloroethane  64475 -
85-0      
Perchloroethylene  127-18-
4 50 340 150 1020  carcinogen   
32 
 Perchloromethyl mercaptan  594-42-
3 0.1 0.8    
Perchlorylfluoride  7616 -
94-6 3 14 6 28  
Perlite    10 (tot)  
5 (resp)     
Peroxyacetic acid (peracetic 
acid)  79-21-0      
Petrol (gasoline)   300     
Petroleum ether  8032 -
32-4  350  1800   
Petroleum distillates   400     
Petroleum spir its 64475 -
85-0 300   350  
Phenacetin  62-44-2      
Phenol  108-95-
2 5 19 10 38  
Phenothiazine  92-84-2  5  10  
p-Phenyline diamine  106-50-
3  0.1    
Phenyl ether (vapour)  101-84-
8 1 9 2 14  
Phenyl ether -biphenyl 
mixture  8004 -
13-5 1 7    
Phenyl glycidyl ether 
(PGE)  122-60-
1 1 6    
Phenyl hydrazine  100-63-
0 0.1 0.4 10  carcinogen  
Phenyl mercaptan  108-98-
5 0.5 2.5    
Phenyl phosphine  638-21-
1 0.05 0.23    
Phorate  298-02-
2  0.05  0.2  
Phosalone  504-20-
1      
Phosgene  75-44-5 0.1 0.4 0.2 0.8  
Phosphine  7803 -
51-2 0.3 0.4 1 1.4  
Phosphoric anhydride 
(acid)  7664 -
38-2  1  3  
Phthalic anhydride  85-44-9 1 6 4 24  
m-Phthalodinitrile  626-17-
5  5    
Picloram  1918 -
02-1  10 (tot)     
Picric acid  88-89-1  0.1  0.3  
Pindone  83-26-1  0.1  0.3  
Piperazine dihydr ochloride  142-64-
3  5    
Pinene  7785 -
70-8       
33 
 Polyvinylchloride  9002 -
86-2  10 (tot)  
 5 
(resp)     
Primiphos -ethyl   1000  1650  1250  2040   
Propane  74-98-6 1000  1800     
Propane -1-1- thiol 107-03-
9   0.5 16  
Propene (Propylene)  115-07-
1     Asyphxiant  
Propargyl alcohol  107-19-
7 1 2 3 6  
Propanol -1-01 71-23-8 200 500 250 625  
Propanol -2-ol 67-63-0 400  500   
o-Propiolactone  57-57-8 0.5 1.5 1 3 carcinogen  
Propionic acid (propanoic 
acid)  79-09-4 10 30 15 45  
Propionitrile  107-12-
0 6 14    
Propoxur  114-26-
1  0.5    
n-Propyl acetate  109-60-
4 200 840 250 1050   
Propylene dichloride  78-87-5 75 350 110 510 carcinogen  
Propylene glycol dinitrate 
(PGDN)  6423 -
43-4 0.02 0.1 0.05 0.3  
Propylene glycol (vapour & 
aerosol)  57-55-6 50 10    
Propylene glycol 
monome thyl ether  107-98-
2 100 360 150 540  
Propylene imine  75-55-8 2 5   carcinogen  
Propylene oxide  75-56-9 20 50   carcinogen  
n-Propyl nitrate  627-13-
4 25 105 40 170  
Propyne  74-99-7 1000  1650  1250  2040   
Pyridine  110-86-
1 5 15 10 30  
Quinone  106-51-
4 0.1 0.4 0.3 1  
Rubber solvent   400 1600     
Sesone  136-78-
7  10  20  
Silica  7631 -
86-9      
Silica  (Crystalline quartz)  14808 -
60-7  0.3 
(tot)  
0.1 
(resp)     
Silica  (Cristobalite)  14464 -
46-1  0.15 
(tot) 
0.05 
(resp)     
Silica(Tridymite)  15468 -  0.15     
34 
 32-3 (tot) 
0.05 
(resp)  
Silica (Tripoli)  1317 -
95-9  0.3 
(tot)  
0.1 
(resp)     
Silica(Fused silica)  60676 -
86-0  0.3 
(tot) 
 0.1 
(resp)     
Silica (Amorphous silca)  7631 -
86-9  6 (tot)     
Silica (Silica gel)  7631 -
86-9  10 (tot)     
Silica (Fumed silca)  7631 -
86-9  2 (resp)     
Silica (Diatomaceous earth)  60676 -
86-0  10 (tot)  
3 (resp)     
Silica (Precipitated silica)  7699 -
41-4  10 (tot)     
Sodium azide  26628 -
22-8 0.1 0.3    
Spent oil        
Spores (see biological 
agents)        
Sprol        
Starch dust  9005 -
25-9  10 (tot)  
5 (resp)     
Stearates    10    
Stibine  7803 -
52-3 0.1 0.5 0.3 1.5  
Stimufol        
Stoddard solvent  8052 -
41-3 100 525 200 1050   
Strychnine  57-24-9  0.15  0.45  
Styrene (monomer)  100-42-
5 50 215 100 425  
Subtilisins (proteolytic 
enzymes)  1395 -
21-7      
Succinonitrile  110-61-
2 6 20    
Sucrose  57-50-1  10 (tot)  
5 (resp)     
Sulfanilamide  63-74-1      
Tetrachloroethylene  127-18-
4 1 7    
Tephenyls  26140 -
60-3      
o-Tephenyl  84-15-1 0.5     
m-Tephenyl  92-06-8      
p-Tephenyl  92-94-4 0.5      
35 
 Terphenyls  92-94-4 0.5 5    
Tetrachloronaphthalene  1335 -
88-2  2  4  
Tetranitromethane  509-14-
8 1 8    
Trinitrotoluene (TNT )  118-96-
7  0.5 
(resp)   3  
o-Tolidine  119-93-
7    0.02 carcinogen  
Toluene  108-88-
3 100 375 150 500  
m-Toluidine  108-44-
1 2 9    
o-Toluidine  95-53-4 2 9    
p-Toluidine  106-49-
0 2 9    
Toluene 2,4 -diamine  95-80-7  2    
Toluene sulphonyl chloride  98-59-9  5    
Toluene di -isocyanate 
(TDI)   0.005      
Toluene -2,4- di-isocyanate  0584 -
84-9 0.005   0.02   
Toluene -2,6-di-isocyanate  91-08-7 0.005      
Toluidine (all isomers)  95-53-4 2 9    
Tributyl phosphate  126-73-
8 0.2 2.5 0.4 4  
Trichloracetic acid  76-03-9 1 6.8    
Trichlorofluoromethane (F -
11) 75-69-4 1000  5600     
Trichloromethylene  79-01-6      
Trichlorotrifluoroethane (F -
113) 76-13-1 1000  7600  1250  9500   
Tricholoroethylene  79-01-6 50 270   carcinogen  
Trichloropronaphanalene  1321 -
65-9  5    
Triclopyr        
Trichloropropane  96-18-4 10 60    
Triethylamine  121-44-
8 10 40 15 60  
Trifluorobromomethane 
(F1381)  75-63-8 1000  6100 1200  7300   
Trimellitic anhydride  552-30-
7 0.005  0.04   extremely toxic  
Trimethylamine(TMA)  75-50-3 10 24 15 36 suspected 
carcinogen  
Trimethylphosphate  512-56-
1      
Trimethyl phosphite  121-45-
9 2 10 5 25  
Triorthocresylphosphate  78-30-8  0.1    
Triphenylamine  603-34-
9  5     
36 
 Triphenylphosphate (TPP)  115-86-
6  3  6  
Turpentine  8006 -
64-2 100 560 150 840  
Ultramarines        
Undecane -1-thiol 5332 -
52-5   0.5 3.9  
Urea  57-13-6  10    
Urethane fumes  51-79-6  5  10 suspected 
carcinogen  
n-Valeraldehy de 110-62-
3 50 175    
Vegetable oil mist  68956 -
68-3  10 (tot)  
5 (resp)     
Vinyl acetate  108-05-
4 10 35 20 70  
Vinyl bromide  593-60-
2 5 22(20)    carcinogen  
Vinyl chloride  75-01-4 1 2 5 10  
Vinyl cyclohexene dioxide  106-87-
6 10 60   carcinogen  
Vinyl f luoride  75-
0205  1 2 5 10  
Vinyl toluene  25013 -
15-4 50 240 100 485  
Vinylidene chloride  75-35-4 1 4 5 20 carcinogen  
Vinylidene fluoride  75-38-7 1  5   
Warfarin  81-81-2  0.1  0.3  
Xylene (o -, m-, p-isomers)  1330 -
20-7 100 435 150 655  
m-xylene  108-38-
3 100  150   
o-xylene  95-47-6 100  150   
p-xylene  106-42-
3 100  150   
m-xylene a,a' - diamine  1477 -
55-0 0.1     
m-xylene a,a' -di-isocyanate  3634 -
83-1 0.005      
Xylidine  1300 -
73-8 0.5 2.5    
2,4-xylidine  95-68-1 5 25    
 
 
 
  
37 
  
C. PERMISSIBLE EMISSION LIM ITS FOR PESTICIDES  
Analytical Method: HPLC, GC -(FID, NPD, MS)  
CHEMICAL NAME  CAS  TWA  STEL  Remarks  
  ppm  mg m-3  ppm  mg m-
3   
2,4-D 94-75-7  10  50  
2,4,5 -T (Tordon)  93-76-5  10   PIC 
Acetoisopropylphenylcarbamat
e   2    
Aldrin  309-00-
2  0.25  0.75 POP/PIC  
Ambush    5  10  
Atrazine  1912 -
24-9  5    
BHC (Hexachlorohexane)  118-74-
1  0.025     
BHC gamma HCH gammexane  58-89-9  0.5  1.5  
Camphechlor (see toxaphin)    0.5  1 POP 
Captafol  01/06/2
5  0.1   carcinogen/PIC  
Carbaryl  63-25-2  5  10  
Carbofuran  1563 -
66-2  0.1   PIC 
Chlordane  57-74-9  0.5  2 POP /PIC  
Chlorpyriphos  2921 -
88-2  0.2  0.6  
DDT  50-29-3  0.5  3 carcinogen/POP/
PIC 
Diazinon  333-41-
5  0.1  0.3  
Dichlorvos (DDVP)  62-73-7 0.1 1 0.3 3 PIC 
Dieldrin  60-57-1  0.25  0.75 carcinogen/POP/
PIC 
Dioxathion (Delnav)  78-34-2  0.2    
Diquat  85-00-7  0.5  1  
Diuron  330-54-
1  10    
Divinyl benzene (DVB)  108-57-
6 10 50    
Endosulafan  115-29-
7  0.1   POP 
Endrin  72-20-8  0.1  0.3 POP 
Fenamiphos  22224 -
92-6  0.1    
Fenthion  55-38-9  0.1  0.3  
Fono fos 944-22-
9  0.1    
Furadan 10G    0.1     
38 
 Furadan 5G    0.1    
Glyphosate  1071 -
83-6  16    
Heptachlor  76-44-6  0.5  2 POP/PIC  
Malathion  121-75-
5  10    
Maneb    0.5    
Methyl parathion  298-00-
0  0.2  0.6 PIC 
Methoxychlor  72-43-5  10 
(Tot)    carcinoge n 
Metribuzin  21087 -
64-9  5    
Mevinphos (Phosdrin)  7786 -
34-7 0.0
1 0.1 0.03 0.3  
Mirex    5 
(resp)    (POP)  
Monocrotophos  6923 -
22-4  0.25   PIC 
Paraquat  4685 -
14-7     POP 
Paraquat dichloride 
(arammoxone)  1910 -
42-5  0.1 
(resp)     
Paraquat dimethylsulph ate 2074 -
50-2      
Parathion (thyphose)  56-38-2  0.1  0.3  
Pentachlorophenol  87-86-5  0.5  1.5 PIC 
Pyrethrum  8003 -
34-7  5    
Rotenone  83-79-4  5  10  
Sulfotep (TEDP)  3689 -
24-5  0.2  0.6  
Temephos  3383 -
96-8  10 
(tot)  
5 
(resp)     
Tetrachlorvinphos        
Tetrahydrofuran (THF)  109-99-
9 200 590 250 735  
Toxaphene (chlorinated 
camphene)  8001 -
35-2  0.5   POP 
  
39 
  
D. PERMISSIBLE EMISSION LIMITS FOR OTHER TRACE ELEMENTS  
Analytical Method: Atomic absorption spectrometry (AAS), X -ray fluorescence or Inductive  coupled 
plasma (ICP ) 
 
CHEMICAL NAME  CAS  TWA  STEL  Remarks  
  ppm  mg m-3  ppm  mg m-3   
Aluminium chloride  7446 -70-
0  2    
Aluminium fumes  7429 -90-
5  5    
Aluminium oxide  1344 -28-
1  10 
(total)  
5 (resp.)     
Aluminium powder  7429 -90-
5  10 
(total)     
   5 (resp.)     
Antimony fumes, dusts, 
mists  7440 -36-
0  0.5    
Antimony compounds  1327 -33-
9  0.5    
ANTU  86-88-4  0.3  0.9  
Arsine  7784 -42-
1 0.05     
Arsenic compounds 
(inorg.)  7440 -38-
2  0.01  0.002   
Arsenic compounds 
(org.) (as As)    0.5    
Arsenic t rioxide  1327 -53-
3  0.01  0.02  
Asbestos fibres (amosite)   0.1    unit: 
fibres/ml  
Asbestos fibres  
(chrysolite)  12001 -
29-5 1.0    unit: 
fibres/ml  
Asbestos fibres  
(crocidolite)  12001 -
28-4 0.1    unit: 
fibres/ml  
Asbestos fibres (other 
forms)   0.1    unit: 
fibres/ml  
Asbestos fibres (any 
mixture)   0.1    unit: 
fibres/ml  
Asphalt fumes  8052 -42-
4  5  10 carcinogen  
Baggasse fibres    10 (tot)     
Barban    5 (resp)     
Barium soluble 
compounds  7440 -39-
3  0.5    
Barium Chromate  10294 -
40-3  0.1    
Barium sulphat e 7727 -43-
7  10 
(total)      
40 
 5 (resp.)  
Bark dust (Hardwood)    1    
Bark dust  (Soft wood)    5    
Beryllium and 
compounds(as 
Beryllium)  7440 -41-
7  0.002   0.005  carcinogen  
Biological agents 
(bacteria & fungi)    106-108   unit: 
particles/m3 
Bismuth telluri de 1304 -82-
1  10    
   selenium sulphide    5    
Bismuth telluride 
(undeped)    10 
(total)  
5 (resp)     
Borax anhydrous  1330 -43-
4  1    
Borax decahydrate  1303 -96-
4  5    
Borax pentahydrate  12179 -
04-3  1    
Boric acid  10043 -
35-3  10  20  
Boron oxide  1303-86-
2  10  20  
Boron tribromide  10294 -
33-4 1 10 3 30  
Boron trifluoride  7637 -07-
2 1 2.8    
Bromacil (Uracil)  314-40-9 1 10 2 20  
Bromine  7726 -95-
6 0.1 0.7 0.3 2  
Bromine pentafluoride  7789 -30-
2 0.1 0.72    
Cadmium /dust (as Cd)  7440 -43-
9  0.005   0.01 carcinogen  
Cadmium oxide fumes 
(as Cd)  1306 -19-
0  0.005   0.01 carcinogen  
Calcium arsenate (as ar)  7778 -44-
1  0.002   0.01 carcinogen  
Calcium carbonate  471-34-1  10 
(total)     
   5 (resp)     
Calcium chromate    0.001     
Calcium cyanamide  156-62-7  0.5  1  
Calcium fluoride  7789 -75-
5  2.5    
Calcium hydroxide  1305 -62-
0  10 
(total)  
5 (resp)     
Calcium oxide  1305 -78-
8  2    
Calcium sulphate  7778 -18-  10     
41 
 9 (total)  
   5(resp)     
Calcium silicate  13444 -
95-2  10 
(total)  
5(resp)     
Carbon blacks  1333 -86-
4  3.5    
Carbon dioxide  124-38-9 5000  9000  15000  27000   
Carbon disulphide  75-15-0 10 30    
Carbon monoxide  630-08-0 30  200   
Carbon tetrabromide  558-13-4 0.1 1.4 0.3 4.1  
Carbon tetrachloride  56-23-5 5 31 10 62  
Carbonyl fluoride  353-50-4 2 5 5 15  
Catechol  120-80-9 5     
Caesium hydroxide  21351 -
79-1  2    
Cellulose  9004 -34-
6  10 
(total)  
5 (resp)     
Cement dust    10 
(total)  
5 (resp)     
Ceramic fibres   0.5    fibres/ml  
Charcoal dust    3.5    
Chromates and chromic 
acid 1333 -82-
0  0.05   carci nogen  
Chromium (III) 
compounds    0.5    
Chromium (VI) 
compounds    0.05    
Chromium powder 
(metal)  7440 -47-
3  0.5    
Chromium (II) salts    0.5    
Chromyl chloride  14977 -
61-8 0.025  0.15   carcinogen  
Clopidol  2971 -90-
6  10(tot)     
Clopyralid    5 (resp)     
Coal tar pitch (benzene 
extract)  8007 -45-
2  0.2   carcinogen  
Cobalt (metal dust & 
fumes)  7440 -48-
4  0.05    
Cobalt carbonyl (as Co)  10210 -
68-1  0.1    
Cobalt hydrocarbonyl (as 
Co) 16842 -
03-8  0.1    
Coffee dust    10 
(total)  
5 (resp)     
Coke oven  emmissions    0.5-0.7    
Copper fumes (as Cu)  1317 -38-
0  0.1     
42 
 Copper powder (dust & 
mist)  7440 -50-
8  1    
Cotton dust (raw)    0.2    
EDTA  6381 -92-
6      
Emery  112-62-9  10 
(total)  
5 (resp)     
Fluorine  7782 -41-
4 0.1 0.2  1  
Glass wool fibres   0.5    fibres/ml  
Graphite (natural)  7782 -42-
5  10 (tot)  
2.5 
(resp)     
Graphite (synthetic), 
activated carbon  7740 -44-
0  10 (tot)  
2 (resp)  
0.1 
(resp)     
Guanidium hydroxide        
Guazatine        
Gypsum (see calcium 
sulphate)    10 (tot)  
5 (resp)     
Hydrogen chloride  7647 -01-
1 5 10    
Hydrogen cyanide  74-90-8 4.7 5    
Hydrogen fluoride  7664 -39-
3 3 2.5 6 5  
Hydrogen iodide  10034 -
85-2      
Hydrogen peroxide  7722 -84-
1 1 1.4 2 3  
Hydrogen seranite  05/02/83  0.05 0.2    
Hydrogen sulphide  7783 -06-
4 10 14 15 21  
Iron oxide fumes & dust 
(as Fe)  1309 -37-
1  5  10  
Iron pentacarbonyl (as 
Fe) 13463 -
40-6 0.1 0.8 0.2 1.6  
Iron salts (soluble as Fe)    1  2  
Kaolin (clay)  1332 -58-
7  10 (tot)  
5 (resp)     
Lead acetate  6086 -56-
4  0.15    
Lead arsenate  10102 -
48-2  0.15  0.45  
Lead chromate (as Cr)  18454 -
12-1  0.05    
Lead dust and fumes  7439 -92-
1  0.05    
Lead sulphide    0.15    
Limestone dust  1317 -65-
3  10 (tot)  
5 (resp)      
43 
 Magnesite  546-90-0  10 (tot)  
5 (resp)     
Magnesium oxide  1309 -48-
4  10    
Magne sium sulphate  7487 -88-
9  10 (tot)  
5 (resp)     
Maleic anhydride  108-31-6 0.25 1    
Manganese & 
compounds (as Mn)  7439 -96-
5  1  3  
Marble  1317 -65-
3  10 (tot)  
5 (resp)     
Mercaptoacetic acid  68-11-1 1 5    
Mercury (element)  7439 -97-
6  0.05   PIC 
Mercur y (inorganic)    0.1   PIC 
Mineral wool fibres    10 (tot)     
Molybdenum  7439 -98-
7  10 (Tot)   20  
Molybdenum soluble 
compounds (as Mo)    5 (resp)   10  
Molybdenum insoluble 
compounds    10    
Neon  7440 -01-
9     Asphyxiant  
Nickel (metal)  7440 -02-
0  1    
Nickel (soluble 
compounds)    0.1   carcinogen  
Nickel carbonyl  13463 -
39-3 0.001  0.007    carcinogen  
Nitric acid  7697 -37-
2 2 5 4 10  
Nitric oxide  10102 -
43-9 25 30 35 45  
Nitrogen  7727 -37-
9      
Nitrogen dioxide  10102 -
44-0 3 6 5 10  
Nitrogen trifluoride  7783 -54-
2 10 30 15 45  
Nitrous oxide  10024 -
97-2 25 45    
Oxygen  7782 -44-
7      
Oxygen difluoride  7783 -41-
7 0.05 0.1 0.15 0.3 poor warning  
Ozone  10028 -
15-6 0.1 0.2 0.3 0.6  
Particulates (inert dust)    10 (tot)  
0. 5 
(resp)     
Particulates (nuisance)    10 (tot)      
44 
  5 (resp)  
10 (tot)  
5 (resp)  
Phosphrous (yellow& 
red) 7723 -14-
0  0.1  0.3  
Phosphorous oxychloride  10025 -
87-3 0.1 0.6 0.5 3  
Phosphrous 
pentachloride  10026 -
13-8 0.1 1    
Phosphorous 
pentasulphide  1314 -80-
3  1  3  
Phosphorous trichloride  7719 -12-
2 0.2 1.5 0.5 3  
Phosphrous pentoxide  1314 -56-
3    1  
Plaster of Paris  26499 -
65-0  10 (tot)  
5 (resp)     
Platinum (black, metal, 
sponge)  7440 -06-
4  1    
Platinum (soluble salts as 
Pt)   0.002     
Potassium bromate  7758 -01-
2  0.1    
Potassium  cyanide  151-50-8   4.7 5  
Potassium hydroxide  1310 -58-
3  2    
Potassium permanganate  7722 -64-
7  5    
Resorcinol  108-46-3 10 45 20 90  
Rhodium (as rhodium)  7440 -16-
6  0.1    
Rhodium ( as rhodium))    0.001     
Ronnel (Fenchlorophos)  299-84-3  10    
Rosin core solder    0.1  0.3  
       
Rouge (Iron (III) oxide)  1309 -37-
1  10 (tot)  
5 (resp)     
Selenium  7782 -49-
2  0.2  0.05  
Selenium disulphide  7488 -56-
4  0.2    
Selenium hexafluoride  7783 -79-
1 0.05 0.4    
Silicon fumes  7440 -21-
3  10 (tot)  
5 (resp)     
Silicon carbide  409-21-2  10 (tot)     
Silicon tetrahydride  7803 -62-
5 5 7 1 1.5  
Silver fumes, dust & 
soluble cpds  7440 -22-
4  0.01    
Simazine    2    
Soapstone (with less than   6 (tot)      
45 
 1% quartz)  3 (resp)  
Sodium arsenate  1000 -48-
95-0  0.002     
Sodium aluminium 
fluoride (cryolite)  15096 -
52-3  2.5    
Sodium bicarbonate  144-55-8  10 (tot)  
5 (resp)     
Sodium bisulphate  7681 -38-
1  10 (tot)     
   5 (resp)     
Sodium hydrogen 
sulphite  7631 -90-
5  5    
Sodium chloride  7758 -19-
2  10 (tot)  
5 (resp )    
Sodium cyanide (as CN)  143-33-9  4.7 5   
Sodium fluoride (as F)  7681 -49-
4  2.5    
Sodium fluoroacetate  62-74-8  0.05  0.15  
Sodium hydroxide  1310 -73-
2  2    
Sodium hypochlorite  7681 -52-
9  2    
Sodium metabisulphite  7681 -57-
4  5    
Strontium chr omate (as 
Cr) 02/06/89   0.05    
Sulphur dioxide  7446 -09-
5 2 5 5 10  
Sulphur hexafluoride  2551 -62-
4 1000  6000  1250  7500   
Sulphur monochloride  10025 -
67-9 1 6 3 18  
Sulphur pentafluoride  5714 -22-
7 0.01 0.1 0.075  0.75  
Sulphur tetrafluoride  7783 -60-
0 0.1 0.4 0.3 1  
Sulphuryl chloride  7791 -25-
5  5    
Sulphuryl fluoride  2699 -79-
8 5 20 10 40  
Sulphur trioxde  7446 -11-
9 0.3 1    
Sulphuric acid  7664 -93-
9  1    
Sulprofos  35400 -
43-2  1    
Superfine glass fibres   0.5    fibres/ml  
Synthetic mineral fibres   0.5    fibres/ml  
Talc (no asbestos)  14807 -
96-6  2 (resp)     
Tantalum (metal and 
oxide)  7440 -25-
7  5  10   
46 
 Tea dust    10 (tot)  
 5 (resp)     
TEPP  1-7-49-3 0.004  0.05 0.01 0.2  
Tellurium and cpds 
except hexafluoride  13494 -
80-9  0.1    
Tellurium hexafluor ide 7783 -80-
4 0.02 0.2    
Tetraethyl lead (as Pb)  78-00-2  0.075     
Tetramethyl lead (as Pb)  75-74-1  0.075     
Tetramethylsuccinonitrile  3333 -52-
6 0.5 3 2 12  
Tetrasodium 
pyrophosphate  7722 -88-
5  5    
Tetryl  479-45-8  1.5  3  
Thallium (soluble cpds a s 
Th) 7440 -28-
0  0.1    
Thionyl chloride  7719 -09-
7 1 5    
Thioglycolic acid  68-11-1 1 4    
Thiram  137-26-8  5  10  
Tin (metal & inorg. cpds)  7440 -31-
5  2  4  
Tin (org. cpds as Sn)    0.1  0.2  
Tin (II) oxide (as Sn)  21651 -
19-4  2    
Tin (IV) oxide (a s Sn)  18282 -
10-5  2    
Titanium  7440 -32-
6      
Titanium dioxide  13463 -
67-7  10 (Tot)   20 carcinogen  
Tungsten  7440 -33-
7  5  10  
Tungsten soluble cpds 
(as tungsten)    1  3  
Tungsten insoluble cpds 
(as tungsten)    5  10  
Uranium  7440 -61-
1      
Uranium (insoluble cpds 
as uranium)  7440 -61-
1  0.2  0.6 carcinogen  
Uranium (soluble cpds)  7440 -61-
1  0.05   carcinogen  
Vanadium dust and 
fumes  1314 -62-
2  0.05    
Vanadim  7440 -62-
2  1    
Vanadium pentoxide 
(dust)  1314 -62-
1  0.05    
Vanadium pentoxide 
(dust)  1314-62-
1  0.05    
Welding fumes    5     
47 
 Wheat flour    10 (tot) 
5(resp)     
Wood dust (hard wood)    1    
Wood dust (soft wood)    5  10  
Wood preservatives   300 1350  400 1800   
Yttrium (metal, cpds, 
dust & mist)  7440 -65-
5  1  3  
Zinc chloride fumes  7646 -85-
7  1  2  
Zinc chromate (as Cr)  13530 -
65-9  0.05    
Zinc oxide dust  1314 -13-
2  5 (tot)     
Zinc oxide fumes  1314 -13-
2  5  10  
Zinc stearate  557-05-1  10 (tot)     
   5 (resp)     
Zirconium compounds 
(as Zr)  7440 -67-
7  5  10  
 
 
 
  
48 
  
SCHEDULE 2:    Regu lation12  
 
PERMISSIBLE EMISSION LIMITS FOR SOURCE SPECIFIC AIR 
POLLUTANTS FROM INDUSTRIAL OPERATIONS  
 
Pollutant  Standard 
For 
Ambient Air  Standard For 
Emissions  
(Point Sources)  Averaging Time 
For Ambient Air  Analytical method  
Carbon 
monoxide  100 mg/m3 
 
60 mg/m3 
 
23 mg/m3 
 
11 mg/m3  
 
 
 
28 mg/m3 
 
10 mg/m3 15 minutes  
 
30 minutes  
 
1 hour  
 
8 hours  Non-dispersive  
Infrared  
Spectrometry  
Carbon 
dioxide  63 mg/m3 
 
16 mg/m3  
 1800 mg/m3 
 
1800 mg/m3 1 hour  
 
8 hr Non-dispersive 
infrared absorption 
spectroscopy (NDIR)  
and/or  
Gas chromatograph 
(GC) equipped with a 
thermal conductivity 
detector (TCD)  
Grain dust  200µgNm -3 15 mg/m3  24 hr  Respirable  particulate  
matter  sampler -X-ray 
techniques  
Hydrocarb
ons   Refer to 
individual 
Hydrocarbon 
(Annex A)  24 hr  Chromatography 
(GC/HPLC)  
Lead  1.0 µgNm -3 
 
 0.5 μg/m3  
  1 month  Atomic absorption 
spectrometry  
(AAS), X -ray 
fluorescence or 
Inductively coupled 
plasma (ICP)  
Nitrogen 
dioxide  200 μg/m3  
 
40 μg/m3  80 μg/m3  
 
40 μg/m3  1 hour  
 
1 year  Modified Jacob & 
Hochheisser (Na -
Arsenite) or 
Chemiluminescence  
Nitrogen 
oxides 
(NOx)  0.2 mg/m3  300 mg/Nm3  24 hr  
1 year Arithmetic 
mean  Modified Jacob & 
Hochheisser (Na -
Arsenite) or 
Chemiluminescence   
49 
 Sulphur 
dioxide  2600 mg/m3  
 
655 mg/m3  
 
260 mg/m3  0.5 mg/m3  
 
0.2 mg/m3  
 10 minutes  
 
24 hours  
 
1 year  Spectrophotometry 
and ion exchange 
chromatography  
 
Sulphur 
trioxide  200µgNm -3  24 hr  Spectrophotometry 
and ion exchange 
chromatography  
 
  
50 
  
SCHEDULE 3 
 
Regulation 21 
 
PERMISSIBLE EMISSION LIMITS  FOR SOURCE SPECIFIC AIR 
POLLUTANTS FROM CEMENT FACTORIES  
 
 Pollutant  Standard 
For 
Ambient 
Air  Standard For 
Emissions  
(Point Sources)  Averaging Time 
For Ambient 
Air Analytical method  
Acid mist  100 µgNm-3 10.0 mg/m3 
HBr;  
5.0 mg/m3 
HNO 3;  
1.0 mg/m3 
H3PO 4; 1.0 
mg/m3 H2SO 4 10 hr   Ion 
Chromatography  
Ammonia  200 µgNm-3 50 mg/Nm3  24 hr  Chemiluminescence  
Carbon 
monoxide  100 mg/m3 
 
60 mg/m3 
 
23 mg/m3 
 
11 mg/m3  
 
 
 
28 mg/m3 
 
10 mg/m3 15 minutes  
 
30 minutes  
 
1 hour  
 
8 hours  Non-dispersive  
Infrared  
Spectrometry  
Carbon 
dioxide  63 mg/m3 
 
16 mg/m3  
 1800 mg/m3 
 
1800 mg/m3 1 hour  
 
8 hr Non-dispersive 
infrared absorption 
spectroscopy 
(NDIR) and/or  
Gas chromatograph 
(GC) equipped with 
a thermal 
conductivity 
detector (TCD)  
Cement  200 µgNm-3 50 mg/Nm3 24 hr  High volume 
Sampler (HVS) , by 
continuous suction 
of  a 1m3/minute 
pump  
Cobalt  3 μg/m3 6.0 μg/m3 1 month  Atomic absorption 
spectrometry  
(AAS), X -ray 
fluorescence or 
Inductively coupled 
plasma (ICP)   
51 
 Copper 
dust 1.0 µgNm-3 0.5 mg/Nm3 1 month  Atomic absorption 
spectrometry  
(AAS), or 
Inductively coupled 
plasma (ICP)  
Grain dust  200µgNm-3 15 mg/m3 24 hr  Respirable  
particulate  
matter  sampler -X-
ray techniques  
Group III 
elements 
(Hg, Cd, 
Th, Sb, As 
Cr, Mn, 
Ni, V   Refer to 
(Annex A)  24 hr  Atomic absorption 
spectrometry  
(AAS), X -ray 
fluorescence or 
Inductively coupled 
plasma (ICP)  
Dioxins  
(PCDDs, 
PCDFs 
and 
coplanar 
PCBs)  Not 
exceeding 
0.6pg -
TEQ/m³   Annual average  High resolution gas 
chromatograph - 
high resolution mass 
spectrometry 
(HRGC -HRMS).  
Lead  1.0 µgNm-3 
 
 0.5 μg/m3 
  1 month  Atomic absorption 
spectrometry  
(AAS), X -ray 
fluorescence or 
Inductively coupled 
plasma (ICP)  
Lime  200 µgNm-3 15 mg/m3 
 24 hr  Gravimetric analysis 
or X-ray techniques  
Nitrogen 
dioxide  200 μg/m3  
 
40 μg/m3 80 μg/m3  
 
40 μg/m3 1 hour  
 
1 year Modified Jacob & 
Hochheisser (Na -
Arsenite) or 
Chemiluminescence  
Nitrogen 
oxides 
(NO x) 0.2 mg/m3 300 mg/Nm3 24 hr  
1 year 
Arithmetic mean  Modified Jacob & 
Hochheisser (Na -
Arsenite) or 
Chemiluminescence  
Sulphur 
dioxide  2600 mg/m3 
 
655 mg/m3 
 
260 mg/m3 0.5 mg/m3  
 
0.2 mg/m3 
 10 minutes  
 
24 hours  
 
1 year  Spectrophotometry 
and ion exchange 
chromatography  
 
Sulphur 
trioxide  200µgNm-3  24 hr  Spectrophotometry 
and ion exchange 
chromatography  
Particulate 
matter  
PM 10  100 µg m-3 
 
60 µg m-3 100 µg m-3 
 
60 µg m-3 24 hr  
 
1 year  -x-ray analysis  
-Tapered Element 
Oscillating  
52 
  Microbalance 
(TEOM)  
- Gravimetric  
 
Particulate 
matter  
PM 2.5  
 60 µg m-3 
 
40 µg m-3 60 µg m-3 
 
40 µg m-3 24 hr  
 
1 year  =Gravimetric  
-x-ray analysis  
-Tapered Element 
Oscillating 
Microbalance 
(TEOM)  
 
VOCs  6 mgNm-3 20mg/Nm3 24 hr  Chromatography 
(GC/HPLC)  
  
53 
  
SCHEDULE  4 
 
PERMISSIBLE EMISSION LIMITS FOR MOTOR  VEHICLE S  
 
Regulation 22(1)  
 
 
Vehicle 
type CO HC NOx  PM Test Procedure  
Grams/kilometer  
Passenger 
cars 2.00 0.25 0.80 
(Petrol)  
1.25 
(Diesel)  0.125  ECE R 49  
Light duty 
truck 
(<3860 kg)  2.30 0.25 1.43 0.160  ECE R 49  
Light Duty 
Truck 
(<3860 kg)  6.20 0.50 1.43 0.160  ECE R 49  
 Grams per kilowatt hour  
Heavy Duty  
Diesel  4.50 1.10 7.00 0.36 ECE R 49  
 
 
SCHEDULE 5:  
PERMISSIBLE EMISSION LIMITS  FOR MOTORCYCLES  
 
Regulation 22(2)  
 
Engine 
Displacement  Engine/Vehicle 
Type  Emission Standard  Test Procedure  
 CO 
(g/km)  HC 
(g/km)  NOx 
(g/km)  Evap. 
(g/test)  
< 700 c.c.  2-stroke  7.0 1.0 2.0  ECE R40 Cold 
start excluding 0 -
40 seconds idle  2-stroke  7.0 1.0 2.0 
< 50 c.c.  2-wheeler  1.0 1.2 NA ECE R40 Warm 
start  3-wheeler  3.5 1.2 
> 50 c.c.  2-wheeler  5.5 1.2 0.3 
3-wheeler  7.0 1.5 0.4 
 
  
54 
  
SCHEDULE 6:  
 
PERMISSIBLE DARK SMOKE LIMITS FOR NEW FACILITIES  
Regulation 23  
 
Pollutant  Standard For Emissions  
(Point Sources)  Averaging Time For 
Ambient Air  
Analytical method  
Smoke  No. 1 on the Ringelmann 
Smoke Chart, or greater than 
twenty (20%) percent 
opacity, exclusive of water 
vapor  Not to exceed 5 min. in 
any one hour  Ringelmann Smoke 
Chart  
 
 
 
SCHEDULE 7:  
PERMISSIBLE DARK SMOKE LIMITS FOR EXISTING FACILITIES  
Regulation 24  
 
 
Pollutant  Standard For Emissions  
(Point Sources)  Averaging Time For 
Ambient Air  
Analytical method  
Smoke  No.2 on the Ringlemann 
scale or 40% observed at 6m 
or more  Not to exceed 5 min . in 
any one hour  Ringelmann Smoke 
Chart  
 
 
 
SCHEDULE 8 : INDOOR AIR QUALITY STANDARDS  
Regulation 28  
 
Pollutant  Standard For 
Emissions  (Point 
Sources)  Criteria  
Acetaldehyde  180 mg m-3  
 Environmental Health Criteria  
Asbestos  0.01 fibres ml-1 Epidemiolog ical dose -response studies  
Benzene  16 mg m-3  
Carbon monoxide  28 mg/m3 
 
10 mg/m3 Health end point  
critical level of COHb <2.5%  
 
Environmental 
tobacco smoke (ETS)  0.0 µg/m3 Unit risk of health effects associated 
with ETS exposure  
Formaldehyde  1.2  
Glass wool fibres  0.5 fibres/ml  
   
55 
 Grain dust  15 mg/m3 Occupational Safety and 
epidemiological data  
n-Hexane  180 mg m-3   
Nitric acid HNO 3 5.0 mg/m3  
 Environmental Health Criteria  
Nitrogen dioxide  80 μg/m3  
 
40 μg/m3 Human clinical exposure data  
Ozone  120 μg/m3 
 
 Epidemiological data  
Particulate matter  
PM 10  
 100 µg m-3 
 
 Epidemiological dose -response studies  
Particulate matter  
PM 2.5  
 60 µg m-3 
 
 Epidemiological dose -response studies  
Smoke  No. 1 on the 
Ringelmann Smoke 
Chart, or greater than 
twenty (20%) percent 
opacity, exclusive of 
water vapor  Occupational Health Guideline  
Soot  500 µgN m-3  
Styrene (monomer)  215 mg m-3  
Tetrachloroethylene  7 mg m-3 Carcinogenic  
Tricholoroethylene  270 mg  m-3 Carcinogenic  
Toluene  375 mg m-3 Carcinogenic  
VOCs  20mg/Nm3 Unit risk data  
Xylene (o -, m-, p-
isomers)  435 mg m-3 Carcinogenic  
 
 
Schedule 9: Currency Point  
Regulation 32 
A currency point shall be equivalent to twenty thousand shillings