EPA collects data from the states and regions on their air quality and state implementation plan (SIP) progress. This information is compiled in a database, and used to create reports, trend charts, and maps.

SIP Status Reports

Reports for nonattainment area SIP requirements

• Status of SIP requirements, listed by state: select a state from the map to view its SIP requirements progress report.
• National status of state SIP requirements: each criteria pollutant links to a full list of the requirements for that pollutant's SIP. Each requirement then links to a report on that requirement's progress, by state.

Reports for infrastructure SIP requirements

• Infrastructure SIP status reports listed by requirement
• Infrastructure SIP status reports listed by state

SIPs approved by EPA

• View approved SIPs by state, organized by states in each EPA region.

Air Quality Data

• Design Values: view statistics that describe the air quality status of a given area relative to the level of EPA's National Ambient Air Quality Standards. These Excel reports are listed by pollutant.
• AirNow: see real-time air pollution data in the United States.
• Air Quality Trends for PM_2.5: View PM level trends; measured nationally, regionally, and locally; up to 2015.
• Air quality measurement statistics for all criteria pollutants are also available in Excel spreadsheets.

Air quality monitoring

• PM_2.5 Ambient Air Monitoring Networks process reported PM data, including visibility and wildfire/smoke monitoring.
• PM Supersites is an ambient monitoring research program intended to address the scientific uncertainties associated with fine particulate matter. Program goals focus on fine particulate characterization, methods testing, and support to health effects and exposure studies.

Designations

• PM Designations: Find information on the process EPA, the states, and the tribes follow to designate areas as "attainment" (meeting) or "nonattainment" (not meeting) the PM standards.
• Green Book: listings of areas designated nonattainment for each NAAQS pollutant. It includes current designation and classification status, area maps, reports, and Federal Register notices.