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National Ambient Air Quality Standards
(NAAQS)

 

The National Ambient Air Quality Standards (NAAQS) define the maximum permissible concentrations for certain pollutants, known as criteria pollutants. Click on the pollutant name for the relevant DEQ factsheet.

PRIMARY STANDARDS

SECONDARY STANDARDS

Pollutant

Level

Averaging Time

Level

Averaging Time

Carbon
Monoxide

9 ppm
(10 mg/m3)

8-hour (1)

None

 

35 ppm
(40 mg/m3)

1-hour (1)

Lead

0.15 µg/m3 (2)

Rolling 3-Month Average

Same as Primary

1.5 µg/m3

Quarterly Average

Same as Primary

Nitrogen
Dioxide

53 ppb (3)

Annual (Arithmetic
Average)

Same as Primary

100 ppb

1-hour (4)

None

Particulate
Matter
(PM10)

150 µg/m3

24-hour (5)

Same as Primary

Particulate
Matter
(PM2.5)

12.0 µg/m3

Annual (6)(Arithmetic
Average)

15.0 µg/m3

Annual (6)(Arithmetic
Average)

35 µg/m3

24-hour (7)

Same as Primary

Ozone

0.070 ppm (2015 std)

8-hour (8)

Same as Primary

Sulfur
Dioxide

0.03 ppm

Annual (Arithmetic
Average)

0.5 ppm

3-hour (1)

0.14 ppm

24-hour (1)

0.075 ppm (9)

1-hour

None

(1)

Not to be exceeded more than once per year

(2)

Final rule signed October 15, 2008

(3)

The official level of the annual NO2 standard is 0.053 ppm, equal to 53 ppb, which is shown here for the purpose of clearer comparison to the 1-hour standard

(4)

To attain this standard, the 3-year average of the 98th percentile of the daily maximum 1-hour average at each monitor within an area must not exceed 100 ppb (effective January 22, 2010).

(5)

Not to be exceeded more than once per year on average over 3 years

(6)

To attain this standard, the 3-year average of the weighted annual mean PM2.5 concentrations from single or multiple community-oriented monitors must not exceed 15.0 µg/m3

(7)

To attain this standard, the 3-year average of the 98th percentile of 24-hour concentrations at each population-oriented monitor within an area must not exceed 35 µg/m3 (effective December 17, 2006).

(8)

To attain this standard, the 3-year average of the fourth-highest daily maximum 8-hour average ozone concentrations measured at each monitor within an area over each year must not exceed 0.070 ppm (upon publication)

(9)

(a) Final rule signed June 2, 2010. To attain this standard, the 3-year average of the 99th percentile of the daily maximum 1-hour average at each monitor within an area must not exceed 75 ppb

Page last updated: October 2, 2015
 

NATIONAL AMBIENT AIR QUALITY STANDARDS

 

 

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