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Sulfur Dioxide (SO₂) Primary National Ambient Air Quality Standards

The Clean Air Act requires EPA to set national air quality standards for sulfur dioxide and five other pollutants considered harmful to public health and the environment (the other pollutants are ozone, particulate matter, nitrogen dioxide, carbon monoxide, 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:      Michael Stewart
                    stewart.michael@epa.gov
                    919-541-7524

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Documents from Review Completed in 1996

Air Quality Index

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Summary of Current NAAQS Table

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