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### NAC 445B.395) NAC 445B.22097 [445.843] Standards ofquality for ambient air. 1. Thetable contained in this section liststhe minimum standards ofquality for ambient air.

This document is based on the January 2005 Legislative Counsel Bureau codification of Nevada Administrative Code Chapter 4458. Permanent amendments adopted 10104105 are incorporated, but the adoption action is not yet recorded inthe historical notes at the end ofeach NAC section. 445B-33 December 2005

POLLWANT Owne Oznne-Lake Tahoe Bas~n. ti90 Carbonmonoxtde less than 5,000' above mean sea level At or greater than 5.000' above mean sea level Carbonmonoudear any elevat~on N~bogen dsox!de

Sulfur droxrde AVERAGNGTUIE lhour
lhour

8 hours

lhour Annual anrhmeuc mean Annual anthmetlc mean 24 hours 3 hours NEVADA STANDARDS" CONCENIRATIO~~ 0 l2ppm (215 ~dm') 0 IOppm (195 pp/m3) 9PP~ (10.500 pdm') 6 PP~ (7.0w~dm')
35 PPm (40.500 pdm3) 0 053 ppm (I00w@m') 0 030 ppm (80 pglm)) 0 14 ppm (365 ~iplrn') 05ppm (l,3W pdd) NAT~ONALSTANDARDS~ MElHOD" Ulnanolet absorpuon
Ulnanolet abrorpt~on

%:AgFZmetry

Gas phase chemzlurmnescence
Ulnanolet nwrescence PWF 0 12 ppm (235 ~g/m')
--

9 PP~ (10 mglm')

35 PP~ (40 mg/m3) 0 053 ppm 1100g@m3) 0 030 ppm 0 14 ppm None SECONDARF Same as primary

None

Same as pr~mary
None 0 5 PP~ MFMOD~ Chenulwn~nescence

2AZZmet.y

Gas phaw chenulununescence Spenmphotomeq (Pararosan8lme method)Notes: Note A: 'The Director shall use the Nevada standards in considering whether to issue a permit for a stationary source and shall ensure that the stationary source will not cause the Nevada standards to be exceeded in areas where the general public has access. Note B: These standards, other than for ozone, particulate matter, and those based on annual averages, must not be exceeded more than once per year. The 1-hourozone standard is attained when the expected number of days per calendar year with a maximum hourly average concentration above the standard is equal to or less than one. The PMlo 24-hour standard is attained when the expected number of days per calendar year with a 24-hour average concentration above the standard, rounded to the nearest 10 Clg/m3, is equal to or less than one. The expected number of days per calendar year is generally based on an average of the number oftimes the standard has been exceeded per year for the last 3 years. The National standards are to be used in determinations of attainment or nonattainment. Note C: Where applicable, concentration is expressed first in units in which it was adopted. All measurements of air quality that are expressed as mass per unit volume, such as micrograms per cubic meter, must be corrected to a reference temperature of 25°C and a reference pressure of 760 mm of Hg (1,013.2 millibars); "ppm" in this table refers to parts per million by volume, or micromoles of regulated air pollutant per mole of gas; "pg/m3" refers to micrograms per cubic meter. Note 

### D: Any reference method specified in accordance with 40 C.F.R. Part 50 or any reference method or equivalent method designated in accordance with 40 C.F.R. Part 53 may be substituted. Note E: National primary standards are the levels of air quality necessary, with an adequate margin of safety, to protect the public health. Note F: National secondary standards are the levels of air quality necessary to protect the public welfare from any known or anticipated adverse effects of aregulated air pollutant. Note G: The ambient air quality standard for hydrogen sulfide does not include naturally occurring background concentrations. 2. These standards of quality for ambient air are minimum goals, and it is the intent of the commission in this section to protect the existing quality of Nevada's air to the extent that it is economically and technically feasible. [Environmental Comm'n, Air Quality Reg. tjtj 12.1-12.1.6,eff. 11-7-75;A and renumbered as tj 12.1, 12-4-76; A 12-15-77; 8-28-79; 

## $5 12.2-12.4, eff. 11-7-75; tj 12.5, eff. 12-4-76;A 8-28- 791-(NAC A 10-19-83; 9-5-84; 12-26-91; 10-30-95; R103-02, 12-17-2002; R198-03, 4-26- 2004)

445B-34 December2005 NATIONAL STANDARDS' POLLUTANT Particulatemana

PMIO
Lead mb) Hydrogen sulfide NEVADA STANDARDS* ' AVWU\~G TIME Annual arithmetic mean 24horn Quarterly arihetic mean l hour MFMOLP High volume PM,. sampling Hi volume sa'plng acid nnractionand .atomicabsorption spectmrnetry - PRIMARYE. sopdm~ ISO pdm' 1.5pdml CONCENEM'IIO~~ SO pP/m3 130

pp/m' 1.5pdm' 0.08ppm (1 12pdm3jG SECONDAR~ Sameasprimary
Samearprimary

- METHOP High volume PM,. sampling Highvolume sampling =id emaction and atomic absorption rpearomebv Ulttaviolet flwrsc~nce