The Clean Air Act requires EPA to set national air ambient quality standards (NAAQS) for six criteria pollutants, including ozone and related photochemical oxidants. The law also requires EPA to periodically review the standards – and the science behind them – periodically to determine whether changes are warranted. Learn more about this process

Contact:   Ben Wells
                    wells.benjamin@epa.gov
                    (919) 541-7507

Analyses and Data Sets from the Current Review

• Design Values and W126 Values for all U.S. ozone monitoring sites, 2000-2018 (XLSX)(2 MB, 6/17/2020)
• Design Values and W126 Values for ozone monitoring sites in or near Class I areas, 2000-2018 (XLSX)(108 K, 6/17/2020)
• Daily Maximum 1-hour ozone concentrations reported at U.S. monitoring sites, 2000-2018 (ZIP)(22 MB, 6/17/2020)
• Daily Maximum 8-hour Ozone concentrations reported at U.S. monitoring sites, 2000-2018 (ZIP)(28 MB, 6/17/2020)

Air Quality Data Sets Developed for the Exposure/Risk Analyses in the Current Review, as described in the Policy Assessment (Appendix 3C)

• APEX air quality inputs for Atlanta, Observed 2015-2017 (ZIP)(59 MB, 6/17/2020)
• Data for Atlanta were not adjusted to meet 75 ppb because the observed 2015-2017 design value was equal to 75 ppb.
• APEX air quality inputs for Atlanta, Adjusted to meet 70 ppb (ZIP)(60 MB, 6/17/2020)
• APEX air quality inputs for Atlanta, Adjusted to meet 65 ppb (ZIP)(59 MB, 6/17/2020)
• APEX air quality inputs for Boston, Observed 2015-2017 (ZIP)(104 MB, 6/17/2020)
• APEX air quality inputs for Boston, Adjusted to meet 75 ppb (ZIP)(105 MB, 6/17/2020)
• APEX air quality inputs for Boston, Adjusted to meet 70 ppb (ZIP)(104 MB, 6/17/2020)
• APEX air quality inputs for Boston, Adjusted to meet 65 ppb (ZIP)(102 MB, 6/17/2020)
• APEX air quality inputs for Dallas, Observed 2015-2017 (ZIP)(84 MB, 6/17/2020)
• APEX air quality inputs for Dallas, Adjusted to meet 75 ppb (ZIP)(84 MB, 6/17/2020)
• APEX air quality inputs for Dallas, Adjusted to meet 70 ppb (ZIP)(83 MB, 6/17/2020)
• APEX air quality inputs for Dallas, Adjusted to meet 65 ppb (ZIP)(82 MB, 6/17/2020)
• APEX air quality inputs for Detroit, Observed 2015-2017 (ZIP)(89 MB, 6/17/2020)
• APEX air quality inputs for Detroit, Adjusted to meet 75 ppb (ZIP)(90 MB, 6/17/2020)
• APEX air quality inputs for Detroit, Adjusted to meet 70 ppb (ZIP)(89 MB, 6/17/2020)
• APEX air quality inputs for Detroit, Adjusted to meet 65 ppb (ZIP)(87 MB, 6/17/2020)
• APEX air quality inputs for Philadelphia, Observed 2015-2017 (ZIP)(103 MB, 6/17/2020)
• APEX air quality inputs for Philadelphia, Adjusted to meet 75 ppb (ZIP)(102 MB, 6/17/2020)
• APEX air quality inputs for Philadelphia, Adjusted to meet 70 ppb (ZIP)(101 MB, 6/17/2020)
• APEX air quality inputs for Philadelphia, Adjusted to meet 65 ppb (ZIP)(100 MB, 6/17/2020)
• APEX air quality inputs for Phoenix, Observed 2015-2017 (ZIP)(62 MB, 6/17/2020)
• APEX air quality inputs for Phoenix, Adjusted to meet 75 ppb (ZIP)(62 MB, 6/17/2020)
• APEX air quality inputs for Phoenix, Adjusted to meet 70 ppb (ZIP)(61 MB, 6/17/2020)
• APEX air quality inputs for Phoenix, Adjusted to meet 65 ppb (ZIP)(60 MB, 6/17/2020)
• APEX air quality inputs for Sacramento, Observed 2015-2017 (ZIP)(34 MB, 6/17/2020)
• APEX air quality inputs for Sacramento, Adjusted to meet 75 ppb (ZIP)(33 MB, 6/17/2020)
• APEX air quality inputs for Sacramento, Adjusted to meet 70 ppb (ZIP)(33 MB, 6/17/2020)
• APEX air quality inputs for Sacramento, Adjusted to meet 65 ppb (ZIP)(33 MB, 6/17/2020)
• APEX air quality inputs for Saint Louis, Observed 2015-2017 (ZIP)(37 MB, 6/17/2020)
• APEX air quality inputs for Saint Louis, Adjusted to meet 75 ppb (ZIP)(38 MB, 6/17/2020)
• APEX air quality inputs for Saint Louis, Adjusted to meet 70 ppb (ZIP)(37 MB, 6/17/2020)
• APEX air quality inputs for Saint Louis, Adjusted to meet 65 ppb (ZIP)(37 MB, 6/17/2020)

Related Links

Data resources related to the W126 exposure index
View technical information on Ozone NAAQS Review
View general public information on air quality standards, trends, health and environmental effects, and programs to reduce Ozone