Data Requirements Rule (DRR): An Update on the 1-Hour SO2 NAAQS
Posted: July 31st, 2014
Back in July 2010, the United States Environmental Protection Agency (U.S. EPA) published a final 1-hour sulfur dioxide (SO2) National Ambient Air Quality Standard (NAAQS)…
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Prevention of Significant Deterioration (PSD) & the Major Modification
Posted: November 4th, 2013
|What is Major Modification|What is a Major Stationary Source?|Any Physical Change in or Change in the Method of Operation|Regulated NSR Pollutant|Significant Emissions Increase|Net Emissions Increase| The implementation at the state level of the major New Source Review (NSR) rules that […]
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Recent Court Case Sets 1-Hour SO2 NAAQS and Air Quality Modeling Precedent
Posted: September 30th, 2013
The U.S. Court of Appeals for the Third Circuit Court recently upheld a U.S. EPA rule that established a sulfur dioxide (SO2) emission limit on a…
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PM2.5 Air Quality Modeling Updates
Posted: April 30th, 2013
There has been much activity over the past six (6) months that will impact how air quality modeling analyses will be conducted for Prevention of Significant Deterioration (PSD) permit applications with respect to particulate matter less than 2.5 microns (PM2.5). […]
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PM2.5 Modeling Guidance Released by U.S. EPA
Posted: March 14th, 2013
On March 4, 2013 the U.S. EPA Office of Air Quality Planning and Standards (OAQPS) released “Draft Guidance for PM2.5 Permit Modeling” memorandum. The memorandum provides…
Read articleArea Designations and Implementation of the Sulfur Dioxide National Ambient Air Quality Standard
Posted: February 22nd, 2013
On February 6, 2013, U.S. EPA issued a white paper outlining the agency’s updated strategy for completing initial area designations under the June 2010 1-hour primary sulfur dioxide (SO2)…
Read articleAfter Further Review: The 1-Hour SO2 NAAQS Stands
Posted: February 13th, 2013
The request for a hearing of an appeal in the case ASARCO LLC v. EPA has been shot down by the Supreme Court. ASARCO’s original challenge to the 1-hour sulfur dioxide…
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