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EPA tightens annual PM2.5 standard; stakeholders warned AQI will show more 'moderate' days
Tennessee Department of Health · March 7, 2024
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Summary
An attendee summarized the Feb. 7 EPA final rule lowering the annual PM2.5 standard from 12 to 9 µg/m3 and explained that the change will shift Air Quality Index breakpoints so more days will register as 'moderate' without necessarily indicating worsened pollution.
A participant representing air-quality interests summarized a Feb. 7 final EPA rule that lowers the annual fine-particulate (PM2.5) standard from 12 micrograms per cubic meter to 9, saying the change tightens the annual standard and alters Air Quality Index (AQI) breakpoints.
The speaker explained the…
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