Regulation & law · 26/12/2013Updated: 10/17/2026 · 1 min read

EPA Approves Washington State's 10-Year PM10 Limited Maintenance Plan

The Environmental Protection Agency (EPA) has proposed approval of a limited maintenance plan submitted by the State of Washington to meet Clean Air Act requirements for the Kent, Seattle, and Tacoma areas, which have seen steady declines in particulate matter levels since 1987.