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State Implementation Plan

STATE IMPLEMENTATION PLAN (SIP): An Air Quality Plan required by the federal Clean Air Act

The Air Planning Section is responsible for submittal of plans required by the federal Clean Air Act of 1970 (as amended in 1975 and 1990) to insure Vermont's attainment and maintenance of federal ambient air quality standards. The common term used to refer to these federally enforceable plans is "State Implementation Plan" or SIP. Plan requirements may be triggered in several ways, but the most general is that a national air quality standard is violated based on actual air quality measurements collected in the state. Historically, Vermont has had a few instances of federal air quality standards being violated and SIP requirements being triggered. Since the early 1980's this has not been the case. However, because of persistent regional air quality standards violations that continue in most of the northeastern states (only Vermont has no current standards violations), Vermont is required by the federal Clean Air Act to have a SIP for purposes of addressing regional ozone air quality.

The documents that can be accessed from the links in the table below describe the policies and programmatic activities being undertaken to maintain Vermont's status of being in attainment of all federal criteria pollutant standards. They also describe those activities and programs being implemented to address regional ozone levels which continue to exceed federal standards in all other states in the Northeast.

Proposed Vermont State Implementation Plan Revisions

Coming soon: Regional Haze SIP Five-Year Progress Report

Vermont Infrastructure State Implementation Plan Revisions


Vermont Greenhouse Gas (GHG) Tailoring Rule SIP Revision 2011


Vermont Regional Haze State Implementation Plan (Revision)


Archived Vermont State Implementation Plan Documentss

General State Implementation Plan Information
SIP Regulations
1993 SIP Narrative


Last Updated:8/1/14


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