Infrastructure SIPs

When EPA establishes a new National Ambient Air Quality Standard (NAAQS) as part of the Clean Air Act, all states are required to develop and submit an infrastructure plan, or I-SIP.

These plans have several parts to them, also known as “elements.” A basic I-SIP includes the state laws, rules, emission controls, governmental structure, and other resources—or the basic “infrastructure”—to meet the air quality standards statewide.

I-SIP elements include provisions for: 

  • Control measures
  • Ambient air quality monitoring
  • Prevention of emissions transport outside the state
  • Source monitoring
  • Emergency power
  • Visibility protection
  • Air quality modeling
  • ​Permitting

View Infrastructure Plans

2006 PM2.5 NAAQS, 1997 PM2.5 NAAQS, and 1997 8-Hour Ozone NAAQS Infrastructure SIP. Part 1> | Part 2 >

2010 NO2 Infrastructure SIP >

2010 SO2 NAAQS I-SIP >

2008 Ozone Standards I-SIP >

2008 Lead Standards I-SIP >