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EPA Decides to Retain 2010 SO2 NAAQS

On February 26, 2019, EPA announced its decision to retain the current sulfur dioxide (SO2) National Ambient Air Quality Standard (NAAQS). The current primary SO2 NAAQS  of 75 parts per billion (ppb) averaged over one hour was established in 2010. The 2010 ruling was significant because it established a short-term, one-hour standard and revoked the prior 24-hour and annual standards. 

The Clean Air Act requires EPA to set NAAQS for six criteria pollutants: carbon monoxide, lead, nitrogen dioxide, ozone, particulate matter, and sulfur dioxide. The statute also requires it to review and revise the NAAQS every five years. After EPA did not review the SO2 NAAQS within five years of the last determination, environmental groups sued it to force a review.  As a result, EPA was under a consent decree to decide whether to retain or revise the SONAAQS by February 25.

Several industry groups asserted that the current SO2 NAAQS was too tough and argued that EPA should weaken the standard. They recommended that EPA raise the NAAQS to 110 – 150 ppb, but environmental groups argued the standard was not protective enough of human health and should be lowered to 50 ppb. Ultimately, EPA rejected both arguments and determined the current standard “is requisite to protect public health, with an adequate margin of safety, from effects of SO2 in ambient air.”  It noted that this was consistent with the April 2018 recommendation of the Clean Air Scientific Advisory Committee, an independent advisory board.  EPA also supported its decision by reiterating that SOlevels in the United States had dropped by more than 85 percent between 1990 and 2017 and more than 60 percent since 2010. 

As a result of this decision, revisions to state implementation plans will not be triggered, and existing sources will not face potential imposition of requirements for installation of  additional controls for SO2. However, the one-hour standard remains a potential barrier to permitting new projects with significant SO2 emissions

© 2020 Dinsmore & Shohl LLP. All rights reserved.National Law Review, Volume IX, Number 60
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About this Author

Anna Skinner, Dinsmore Law Firm, Environmental and Litigation Attorney
Associate

Anna Claire is a member of our Litigation Department where she focuses her practice on environmental law. Her experience includes assisting clients on environmental issues in the context of business transactions and compliance counseling. Anna Claire has extensive experience with Clean Air Act enforcement and compliance issues and has helped clients against environmental enforcement initiatives directed at electric utilities. She also has experience in many aspects of discovery and trial preparation, including factual investigation, drafting motions, and witness...

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