or double-deck roof which rests on the 

standards of the petroleum 

ng discharge of gases and 

uted in revision for NAC 445B.395) 

NAC 445B.22097 [445.843] Standards of quality for ambient air. 

1. The table contained in this section lists the minimum standards of quality 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 in the historical notes at the 

end of each NAC section. 445B-33 

December 2005 

POLLWANT 

Owne 

Oznne-Lake Tahoe 

Bas~n. ti90 

Carbon monoxtde 

less than 5,000' 

above mean sea level 

At or greater 

than 5.000' above 

mean sea level 

Carbon monoude ar any elevat~on 

N~bogen dsox!de 

Sulfur droxrde 

AVERAGNG TUIE 

l hour 

l hour 

8 hours 

l hour 

Annual anrhmeuc 

mean 

Annual anthmetlc mean 

24 hours 

3 hours 

NEVADA STANDARDS" 

CONCENIRATIO~~ 

0 l2ppm 

(215 ~dm') 

0 IOppm 

(195 pp/m3) 

9 PP~ (10.500 pdm') 

6 PP~ 

(7.0w~dm') 

35 PPm (40.500 pdm3) 

0 053 ppm 

(I00 w@m') 0 030 ppm 

(80 pglm)) 

0 14 ppm 

(365 ~iplrn') 

05ppm 

(l,3W pdd) 

NAT~ONAL STANDARDS~ 

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 

1100 g@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-hour ozone 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 

of times 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 a regulated 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. 1 1-7-75; A and renumbered as 

tj 12.1, 12-4-76; A 12-15-77; 8-28-79; $5 12.2-12.4, eff. 1 1-7-75; 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 

December 2005 

NATIONAL STANDARDS' 

POLLUTANT 

Particulate mana 

PMIO 

Lead mb) 

Hydrogen sulfide 

NEVADA STANDARDS* ' 

AVWU\~G TIME 

Annual arithmetic mean 

24 horn 

Quarterly arihetic mean 

l hour 

MFMOLP 

High volume PM,. sampling 

Hi volume sa'plng acid nnraction and .atomic absorption 

spectmrnetry 

- 

PRIMARYE. 

sopdm~ 

I SO pdm' 

1.5 pdml 

CONCENEM'IIO~~ 

SO pP/m3 

130 pp/m' 

1.5 pdm' 

0.08 ppm (1 12 pdm3jG 

SECONDAR~ 

Same as primary 

Same ar primary 

- 

METHOP 

High volume PM,. 

sampling 

High volume sampling =id emaction and atomic absorption 

rpearomebv 

Ulttaviolet 

flwrsc~nce