Approved Air State Implementation Plans (SIPs)

This site contains information about air quality regulations called State Implementation PlansHelpState Implementation PlansEPA approved state plans for the establishment, regulation, and enforcement of air pollution standards. that have been approved by the EPA. To find the status of SIPs in process, visit Status of SIPs for Designated Areas.

SIP Requirements
in the Clean Air Act

SIP Approval Actions
in the Federal Register

About SIPs