Tag Archives: CASAC

EPA’s Latest Particulate Review Shows Impacts Below the Current NAAQS. How Will Trump Avoid Doing Something About It?

Last week, EPA posted its draft Integrated Science Assessment for Particulate MatterIt’s the foundational document for EPA’s periodic review of its National Ambient Air Quality Standard for PM.  The current standard for PM2.5, promulgated in 2012, is 12 ug/m3.

Section 109 of the Clean Air Act requires the Administrator to set the NAAQS “requisite to protect the public health” with “an adequate margin of safety.”

The new ISA states that:

Evidence from U.S.… More

EPA Lowers the Ozone Standard to 70 PPB: Industry Isn’t Happy, But It Should Be

On Thursday, EPA finally released its final rule revising the ozone NAAQS to 70 ppb.  I do not spend much time peering into a crystal ball, fortune-teller with a shining crystal ballbut I will go out on a limb and say that the industry challenges to the rule will fail. Just ain’t gonna happen.

The environmental group challenges pose a more interesting question.  There’s a fair bit of evidence of health impacts below 70 ppb,… More

Mississippi v. EPA: Support of the Clean Air Science Advisory Committee is Not Necessary to Affirm EPA’s NAAQS

On Tuesday, in Mississippi v. EPA, the Court of Appeals for the D.C. Circuit affirmed EPA’s 2008 NAAQS for ozone of 0.075 ppm.  However, it remanded EPA’s decision to set the secondary NAAQS, for public welfare, at the same 0.075 ppm level.  With respect to the primary standard, the Court gave short shrift to industry and red-state challenges that the standard was too stringent.  This is not surprising,… More

Clean Air Grab Bag

There have been so many developments recently on the air front (and I’m so far behind due to an appellate brief) that I thought I would combine a few recent items.

First, oral arguments were heard Monday on the challenges to the Bush EPA ozone NAAQS of 0.075 ppb. As I have previously noted, the Court of Appeals for the District of Columbia Circuit has made pretty plain that EPA cannot ignore the recommendations of the Clean Air Science Advisory Committee in setting the NAAQS. … More

More on a New Ozone NAAQS: EPA’s Clean Air Science Advisory Committee Endorses EPA’s Proposed Range

As we noted a few weeks ago, EPA has proposed lowering the NAAQS to a range of from 0.060 ppm – 0.070 ppm. Earlier this week, EPA’s Clean Air Science Advisory Committee, or CASAC, met and endorsed EPA’s proposed range. Some CASAC members did express concern about EPA’s proposed secondary seasonal standard, intended to protect crops and forests. However, overall, the CASAC seal of approval is pretty much the end of this argument.… More