State Implementation Plan (SIP) & Attainment
States are responsible for developing plans and implementing programs to meet and maintain National Ambient Air Quality Standards (NAAQS). Areas that meet the national ambient air quality standard are considered to be in "attainment" while areas in which air pollution levels persistently exceed ambient air quality standards may be designated "nonattainment." When NAAQS are tightened to better protect public health, some areas previously considered attainment may be designated to nonattainment even though monitoring shows that air quality continues to improve.
- General SIP Information and Helpful Links to Other Resources
- Programs (CSAPR, Greenhouse Gases, State Plans, Conformity, etc.)
- Attainment Status Map
