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DNR News Releases

Archive by tag: fine particleReturn

DNR to Delay Implementation of Revised PM2.5 SILs

• 7/30/2018 8:29:00 AM
• View Count 2657

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

• 6/8/2018 3:13:00 PM
• View Count 2958

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.

Smoke lingers from Fourth of July celebrations in Polk County

• 7/5/2017 1:10:00 PM
• View Count 3801

Yesterday an air monitor recorded elevated levels of fine particle pollution in Des Moines. An increase in fine particle pollution levels began around dusk on Independence Day and persisted overnight. 

Avoid areas of heavy smoke near fireworks activities and displays

• 6/29/2017 1:51:00 PM
• View Count 3340

WINDSOR HEIGHTS – Whether attending a spectacular Fourth of July celebration or a picnic with backyard fireworks, the aftermath of drifting smoke can cause breathing problems for some. If the air is stagnant, fine particles can be trapped near the ground and build to unhealthy levels.