Clean Air Branch

When the Environmental Protection Agency (EPA) establishes a new or revised National Ambient Air Quality Standard (NAAQS) under the Clean Air Act (CAA) Sections 110(a)(1) and (2), all states a required to revise their State Implementation Plan (SIP) to show that they have the authority and programs needed to implement, maintain, and enforce the new or revised air quality standard.  This type of submission is referred to as an infrastructure state implementation plan, or I-SIP.

In accordance with CAA Section 110(a)(2), the I-SIP must adequately address each of the required elements to be approved by the EPA.  These elements include the state’s legal authority, ambient air quality monitoring, permitting, enforcement, and emergency events.  Once the I-SIP establishes an infrastructure surrounding the NAAQS revisions sufficient to implement, maintain, and enforce the standards across the state, the plan is approved.

Further information about the specific CAA Section 110(a)(2) elements can be found here.

Hawaii I-SIPs:

• 2010 SO2 NAAQS, 2012 PM2.5 NAAQS, and 2015 Ozone NAAQS (Draft)