Category Archives: Particulate Matter

In Case You Were Wondering, EPA’s PM2.5 Decision Really Was Horrible

Last month, I posted that EPA’s decision to retain the current PM2.5 NAAQS of 12 ug/m3 was the single worst decision by Trump’s EPA.  Since then, I have not received any comments suggesting that my ranking was incorrect.  In case anyone was still in doubt, Environmental Research recently released an on-line Pre-proof of A National Difference in Differences Analysis of the Effect of PM2.5 on Annual Death Rates. … More

EPA Finalizes Decision to Retain the Existing PM2.5 NAAQS — Single Worst Environmental Decision of the Trump Administration?

Yesterday, EPA finalized its decision to retain the existing PM2.5 NAAQS of 12 ug/m3, rejecting substantial scientific evidence that PM2.5 causes significant harm at concentrations below 12 ug/m3.  In fact, as noted in one of my prior posts on this subject, an article in the New England Journal of Medicine estimated that exposure to PM2.5 at concentrations below 12 ug/m3 causes more than 10,000 deaths annually. … More

Who Gets To Decide What is a Major Source That Requires a Permit? That’s a Fine Question

The recent decision by the 8th Circuit that the Coyote Creek Mining Company did not require a major source permit under the Clean Air Act is both fascinating and important.  The question on the merits was whether CCMC had to include its fugitive emissions in determining its potential to emit.  Such emissions are normally excluded, but are included if they are part of a “coal processing plant.”

The Court concluded that the regulations are ambiguous and that EPA guidance did not resolve the issue. … More