Air Quality

More PM2.5 NAAQS Related Updates

Posted: May 30th, 2024

There have been more guidance updates and rule making in the last month that will impact both air quality modeling and the designation process for the lowered annual particulate matter less than 2.5 microns (PM2.5) National Ambient Air Quality Standard […]

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CISWI and OSWI Federal Plans Proposed Consent Decree

Posted: April 23rd, 2024

On April 5, 2024, the U.S. Environmental Protection Agency (U.S. EPA) published a notice of a proposed consent decree regarding U.S. EPA’s failure to issue final Federal Implementation Plans (FIPs) to implement the emissions guidelines for existing facilities under the […]

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U.S. EPA Proposes Revisions to the Secondary NAAQS

Posted: April 17th, 2024

On April 11, 2024 the United States Environmental Protection Agency (U.S. EPA) issued its proposed revisions to the secondary National Ambient Air Quality Standards (NAAQS). The relatively minor proposed changes, published in the Federal Register on April 15, 2024, only […]

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