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Air Quality Program

Infrastructure, Rules, and Programs SIPs

Infrastructure SIPs

Wherever EPA establishes a new NAAQS or revises an existing NAAQS, the federal Clean Air Act requires Washington to develop a 110(a) infrastructure State Implementation Plan (SIP). The infrastructure SIP demonstrates that Washington has the necessary legal authority, regulatory structure, and adequate resources to implement the NAAQS in all areas of the state.

A list of infrastructure SIPs:

SIP Title


Infrastructure SIP Certification for the 2008 Lead National Ambient Air Quality Standards. Sections 110(a)(1)-(2) of the Clean Air Act. (Click here for a copy of this document - PDF.)

Ecology plans to submit the proposed SIP to EPA for approval in March/April 2014. For more information, read the news release, check the public calendar, or contact Laurie Hulse-Moyer at 360-407-6783.

Infrastructure SIP Certification for the 1997 8-hour Ozone National Ambient Air Quality Standards. Sections 110(a)(1) - (2) of the Clean Air Act. (Click here for a copy of this document - PDF.)

EPA partially approved this submittal on May 24, 2012. For more information, see Federal Register Notice 77 FR 30902.

Addressing the Interstate Transport of Ozone and Fine Particulate Matter.  Section 110 (a)(2)(D)(i) of the Clean Air Act State Implementation Plan for 1997 8-Hour Ozone and PM2.5 National Ambient Air Quality Standards.

EPA approved on 08/27/2007. For more information see Federal Register Notice 72 FR 35015.


Washington State rules are submitted along with a SIP to provide an enforceable means to carry out the control strategy in the SIP.  Washington may also submit rules or rule updates alone to EPA to satisfy federal requirements or as a state initiative to “strengthen the SIP” (improve pollution control programs).

When EPA approves a rule as part of Washington’s SIP, the rule becomes “federally enforceable”.  That is, if Washington does not implement the rule, EPA can step in and enforce the rule at the federal level.

Program SIPs

Some SIPs satisfy programs or parts of programs required by the CAA.  The subjects addressed by these SIPs can be quite diverse. One example is the Motor Vehicle Inspection & Maintenance Program known in Washington as the Emission Check Program. This program is required for carbon monoxide and ozone nonattainment areas. Other examples include the Washington State Visibility Protection Program and the 1998 Smoke Management Program.

Program SIPs currently being developed or recently submitted to EPA for approval:

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