The Clean Air Act requires EPA to set national air quality standards for particulate matter and five other pollutants considered harmful to public health and the environment (the other pollutants are ozone, nitrogen oxides, carbon monoxide, sulfur dioxide and lead). The law also requires EPA to periodically review the standards to ensure that they provide adequate health and environmental protection, and to update those standards as necessary. Learn more about this process

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

Analyses and Data Sets from Review Completed in 2008

• AQS Hourly Ozone Data (1-hour values)(1 pg, 130 MB)
• AQS Daily Ozone Data (1-hour and 8-hour daily maximum statistics)(1 pg, 39 MB)
• AQS Annual Ozone Data (1-hour and 8-hour annual summary statistics)(1 pg, 660 K)
• AQS Metadata(1 pg, 177 K)
• CASTNET Hourly Ozone Data (1-hour values) - file too large to post (e-mail Ben Wells to request)
• CASTNET Hourly Ozone Data (8-hour values)(1 pg, 47 MB)
• CASTNET Daily Ozone Data (daily maximum 1-hour and 8-hour values)(1 pg, 2 MB)
• CASTNET Metadata(1 pg, 8 K)

Related Links

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