Air quality status and applicable state implementation plans

As of 1995, the central Puget Sound region was designated by the EPA as failing to meet federal air quality standards for three pollutants: carbon monoxide, ozone, and particulate matter. The region held 'moderate plus' status for carbon monoxide and 'marginal' status for ozone, with State Implementation Plans (SIPs) submitted to the EPA awaiting approval. Based on improving pollution levels, the region was working toward 'maintenance' status redesignation, with 10-year maintenance plans expected to be submitted to the EPA and approved by 1996.

Notes

This document describes the air quality nonattainment status of the central Puget Sound region for carbon monoxide, ozone, and particulate matter (PM10), as classified by the EPA. It outlines the applicable State Implementation Plans (SIPs) for each pollutant and the conformity analysis requirements for the Transportation Improvement Program (TIP). The document also notes ongoing development of 10-year maintenance plans in anticipation of redesignation to maintenance status.

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