Lion News

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12/28/2020

No Change to NAAQS for Ozone, Particulate Matter

US EPA will retain, without change, the current National Ambient Air Quality Standards (NAAQS) for both ozone and particulate matter (PM).  

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08/18/2020

EPA Proposes No Change to Ozone NAAQS

On August 14, US EPA proposed no change to its National Ambient Air Quality Standard for photochemical oxidants (e.g., ozone).

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05/11/2018

EPA Goes Back-to-Basics on NAAQS Reviews

Current US EPA Administrator Scott Pruitt on May 9th signed a memorandum establishing a “back-to-basics” approach to Clean Air Act-required reviews of National Ambient Air Quality Standards (NAAQS).  

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05/07/2018

Clean Air Act State Implementation Plans, Explained

On any given day, you are likely to see EPA approve and promulgate Clean Air Act State Implementation Plans (SIPs) in the Federal Register.  Find out what goes in a State Implementation Plan and how EPA regulates air pollution sources in states or terretories without a unique Plan.  

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03/19/2018

Court Orders EPA to Complete Area Designations for 2015 Ozone NAAQS

On March 12, a US District Court ordered EPA to complete its area designations by April 30, 2018 under its new National Ambient Air Quality Standard (NAAQS) for ozone, promulgated in late 2015.  

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08/14/2017

EPA Proposes Keeping Current NAAQS for Nitrogen Dioxide

EPA proposed last month to retain the current National Ambient Air Quality Standards (NAAQS) for nitrogen dioxide (NO2), without revision. 

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04/12/2016

Quick Guide: National Air Quality Standards

US EPA tightened the National Ambient Air Quality Standard (NAAQS) for ozone last year to 0.07 parts per million. The previous ozone NAAQS, finalized in 2008, was 0.075 ppm. The NAAQS is the maximum amount of ozone in the ambient air (air external to buildings to which the general public has access) that is currently considered safe for human health...

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