Laws & Regulations

Sulfur Dioxide (SO2) Designations Round 3: Indiana State Recommendation and EPA Response

Indiana recommendation for Round 3 area designations and EPA's response.

Sulfur Dioxide (SO2) Designations Round 3: American Samoa Recommendation and EPA Response

American Samoa recommendation for Round 3 area designations and EPA's response.

Sulfur Dioxide (SO2) Designations Round 3: Alabama State Recommendation and EPA Response

Alabama recommendation for Round 3 area designations and EPA's response.

Area Designations for the 2024 Revised Secondary Annual Sulfur Dioxide National Ambient Air Quality Standard

Memorandum for the 2010 primary SO2 NAAQS to better reflect the Round 4 designations process

Per- and Polyfluoroalkyl Substances (PFAS) in Sewage Sludge

Per- and Polyfluoroalkyl Substances (PFAS) in Biosolids

EPA Makes Findings of Failure to Submit State Implementation Plans (SIPs) - 1999 Regional Haze Program

Air Quality Designations for Nitrogen Dioxide

This area provides information on the process EPA, the states, and the tribes follow to designate areas as attainment (meeting) or nonattainment (not meeting) the nitrogen dioxide quality standards.

Air Quality Designations for Ozone

This area provides information on the process EPA, the states, and the tribes follow to designate areas as attainment (meeting) or nonattainment (not meeting) the ground-level ozone standards.

Nitrogen Dioxide Designations - South Carolina State Recommendations and EPA Response

2010 Nitrogen dioxide (NO2) standards. South Carolina state recommendations and EPA response.

Nitrogen Dioxide Designations - Illinois State Recommendations and EPA Response

2010 Nitrogen dioxide (NO2) standards. Illinois state recommendation and EPA response.

Nitrogen Dioxide Designations - North Carolina State Recommendations and EPA Response

2010 Nitrogen dioxide (NO2) standards. North Carolina state recommendations and EPA response.

Nitrogen Dioxide Designations - Michigan State Recommendations and EPA Response

2010 Nitrogen dioxide (NO2) standards. Michigan state recommendation and EPA response.

Nitrogen Dioxide Designations - Lytton Rancheria of California Tribal Recommendation and EPA Response

2010 Nitrogen dioxide (NO2) standards. Lytton Rancheria of California Tribal recommendation and EPA response.

Nitrogen Dioxide Designations - Puerto Rico (U.S. Territory) State Recommendation and EPA Response

2010 Nitrogen dioxide (NO2) standards. Puerto Rico (U.S. Territory) state recommendation and EPA response.

Nitrogen Dioxide Designations - Washington, District of Columbia State Recommendation and EPA Response

2010 Nitrogen dioxide (NO2) standards. Washington, D.C. state recommendation and EPA response.

Findings of Failure to Submit Regional Haze State Implementation Plans for the Second Planning Period

Creating Draft page for upcoming FFS announcement. This page will contain the fact sheet and pre-publication version of the FFS.

Revised Air Quality Designations for the 2015 Ozone National Ambient Air Quality Standards

EPA is taking the next step in the Clean Air Act process to implement the national air quality standards for ozone set in 2015.

SO2 Designations - Round 4 State Recommendations and EPA Responses

Sulfur Dioxide Designations - State Recommendations Round 1

Recommendations for Area Designations Round 3

Letters from states recommending area designations.

State and Tribal Indoor Radon Grants (SIRG) Program and Resources

This guidance explains the standardized state template for SIRG measures,as required by the OMB and answers questions about the template. The Program guidance is intended to reconcile all legal, policy and programmatic changes that affected SIRG.