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

Analyses and Data Sets from Current Review

Analyses supporting the NAAQS Review Process are ongoing. As analyses are completed, they will be posted here along with source data.

Related Links

View primary technical information on Carbon Monoxide NAAQS Review
View general public information on air quality standards, trends, health effects, and programs to reduce Carbon Monoxide