Nevada Administrative Code › Chapter 445B - Air Controls › AIR POLLUTION › General Provisions › Section 445B.22097 - Standards of quality for ambient air

Current through June 11,
				2024
1. The table
				contained in this section lists the minimum state standards of quality for
				ambient air.
STATE STANDARDSA,
															B,
															D
POLLUTANT
AVERAGING TIME
CONCENTRATIONC
Ozone
8 hours
0.070 ppm
Ozone-Lake Tahoe Basin, #90
1 hour
0.10 ppm
(195
								µg/m3)
Carbon monoxide less than 5,000' above mean sea
								level
8 hours
9 ppm
(10,500
								µg/m3)
At or greater than 5,000' above mean sea
								level
6 ppm
(7,000
								µg/m3)
Carbon monoxide at any elevation
1 hour
35 ppm
(40,500
								µg/m3)
Nitrogen dioxide
Annual arithmetic mean
0.053 ppm
(100
								µg/m3)
1 hour
100 ppb
Sulfur dioxide
Annual arithmetic mean
0.030 ppm
(80 µg/m3)
24 hours
0.14 ppm
(365
								µg/m3)
3 hours
0.5 ppm
(1,300
								µg/m3)
1 hour
75 ppb
Particulate matter as
								PM10
24 hours
150 µg/m3
Particulate matter as
								PM2.5
Annual arithmetic mean
12.0 µg/m3
24 hours
35 µg/m3
Lead (Pb)
Rolling 3 mo. average
0.15 µg/m3
Hydrogen sulfide
1 hour
0.08 ppm
(112
								µg/m3) E
Notes:
Note A: The Director shall use the state standards in
				  considering whether to issue a permit for a stationary source and shall ensure
				  that the stationary source will not cause the state standards to be exceeded in
				  areas where the general public has access. For the 2006 particulate matter as
				  PM2.5 24-hour and annual standards, the 2010 nitrogen
				  dioxide 1-hour standard and the 2010 sulfur dioxide 1-hour standard, the
				  Director shall use the form of the standards set forth in
				  40
				  C.F.R. §§
										50.11,
				  50.13
				  and
				  50.17,
				  as those provisions existed on June 23, 2014, to ensure that the state standard
				  is no more stringent than the national ambient air quality standard in
				  determining whether the stationary source will comply with the state standards
				  in areas where the general public has access.
Note B: National ambient air quality standards are used in
				  determinations of attainment or nonattainment. The form of a national ambient
				  air quality standard is the criteria which must be satisfied for each
				  respective concentration level of a standard for the purposes of attainment.
				  The form for each national ambient air quality standard is set forth in 40
				  C.F.R. Part 50 and may be viewed at
				  http://www.epa.gov/criteria-air-pollutants/naaqs-table [File Link Not
				  Available] . National primary standards are the levels of air quality
				  necessary, with an adequate margin of safety, to protect the public health.
				  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 C: Where applicable, concentration is expressed first in
				  units in which it was adopted. 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 degrees Centigrade and a reference pressure of
				  760 mm of Hg (1,013.2 millibars), except measurements of particulate matter as
				  PM2.5 and lead (Pb), which are calculated in micrograms
				  per cubic meter at local conditions; "ppb" in this table refers to parts per
				  billion by volume, or nanomoles of regulated air pollutant per mole of gas;
				  "ppm" refers to parts per million by volume, or micromoles of regulated air
				  pollutant per mole of gas; "µg/m3" refers to
				  micrograms per cubic meter.
Note D: Any reference method or equivalent method designated
				  in accordance with 40 C.F.R. Part 53 may be used to measure a regulated air
				  pollutant.
Note E: The state ambient air quality standard for hydrogen
				  sulfide does not include naturally occurring background concentrations.
2. The state 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. §§ 12.1-12.1.6,
				  eff. 11-7-75; A and renumbered as § 12.1, 12-4-76; A 12-15-77; 8-28-79;
				  §§ 12.2-12.4, eff. 11-7-75; § 12.5, eff. 12-4-76; A 8-28-79-NAC
				  A 10-19-83; 9-5-84; 12-26-91; 10-30-95; R103-02, 12-17-2002; R198-03,
				  4-26-2004; R038-12, 9-14-2012; R042-13, 12-23-2013; A by
				  R145-13,
				  eff. 3/19/2014; A by
				  R027-15,
				  eff. 10/27/2015; A by
				  R145-17AP,
				  eff. 5/16/2018
NRS 445B.210