NY.gov Portal State Agency Listing Search all of NY.gov
D E C banner
D E C banner

Disclaimer

The New York State Department of Environmental Conservation has added a link to a translation service developed by Microsoft Inc., entitled Bing Translator, as a convenience to visitors to the DEC website who speak languages other than English.

Additional information can be found at DEC's Language Assistance Page.

National Ambient Air Quality Standards

National Ambient Air Quality Standards
Pollutant Primary Standards Secondary Standards
Level Averaging Times Level Averaging Times
Carbon Monoxide 9 ppm (10 mg/m3) 8-hour(1) None
35 ppm (40 mg/m3) 1-hour(1)
Lead 0.15µg/m3(2) Rolling 3-month Average Same as Primary
Nitrogen Dioxide 53 ppb Annual (Arithmetic Mean) Same as Primary
100 ppb 1-hour(3) None
Particulate Matter (PM10) 150µg/m3 24-hour(4) Same as Primary
Particulate Matter (PM2.5) 12.0µg/m3 Annual(5) (Arith. Mean) Same as Primary
35µg/m3 24-hour(6) Same as Primary
Ozone 0.075 ppm (2008 std) 8-hour(7) Same as Primary
0.08 ppm (1997 std) 8-hour(8) Same as Primary
0.12 ppm 1-hour(9)
Not applicable in NYS
Same as Primary
Sulfur Oxides 75 ppb 1-hour(10) 3-hour(1) 0.5 ppm (1300µg/m3)

Footnotes

(1) Not to be exceeded more than once per year.
(2) Effective 1/12/2009, replaces the previous quarterly average value of 1.5µg/m3.
(3) 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).
(4) Not to be exceeded more than once per year on average over 3 years.
(5) 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 12.0µg/m3. Effective March 18, 2013.
(6) 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 35µg/m3(effective December 17, 2006).
(7) 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 0.075 ppm (effective May 27, 2008).
(8) (a) 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 0.08 ppm.
(b) The 1997 standard-and the implementation rules for that standard-will remain in place for implementation purposes as EPA undertakes rulemaking to address the transition from the 1997 ozone standard to the 2008 ozone standard.
(c) EPA is in the process of reconsidering these standards (set in March 2008).
(9) (a) The standard is attained when the expected number of days per calendar year with maximum hourly average concentrations above 0.12 ppm is < 1.
(b) As of June 15, 2005 EPA revoked the 1-hour ozone standard in all areas except the 8-hour ozone nonattainment Early Action Compact (EAC) Areas.
(10) Effective August 23, 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.