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DNR News Releases

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DNR to Delay Implementation of Revised PM2.5 SILs

DNR to Delay Implementation of Revised PM2.5 SILs

  • 7/30/2018 8:29:00 AM
  • View Count 2431
On April 17, 2018 EPA released a memo titled “Guidance on Significant Impact Levels for Ozone and Fine Particles in the Prevention of Significant Deterioration Permitting Program.” In this guidance EPA recommended a 24-hour significant impact level (SIL) of 1.2 µg/m3 for particulate matter less than or equal to 2.5 microns in diameter (PM2.5), which is the same level as the previously proposed draft SIL
Opportunity for Comment: PM2.5 SILs and AAR Summary Web Page

Opportunity for Comment: PM2.5 SILs and AAR Summary Web Page

  • 6/8/2018 3:13:00 PM
  • View Count 2734
The DNR is proposing updates to PSD modeling guidance and is announcing the release of a new web page. Specifically, EPA’s recently released PM2.5 Significant Impact Levels (SILs) have been incorporated into the Prevention of Significant Deterioration (PSD) Modeling Guidelines, and a new web page has been added to assist applicants with filling out Form MD. The DNR is providing this information for a two-week informal comment period.