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

On October 1, 2015, EPA finally released its final rule revising the ozone NAAQS to 70 ppb. I do not spend much time peering into a crystal ball, but I will go out on a limb and say that the industry challenges to the rule...more

The D.C. Circuit Sends EPA Back to the Drawing Board to Fix Its Transport Rule Emissions Budgets

The Clean Air Act’s good neighbor provision prohibits upwind states from emitting air pollutants in amounts that will “contribute significantly to nonattainment” of a national ambient air quality standard in a downwind state....more

EPA Finally Proposes a Revised Ozone Standard, Sort Of

Yesterday, EPA finally proposed a revised ambient air quality standard for ozone – except that the agency is still hedging its bets. The Clean Air Science Advisory Committee had previously supported a revised ozone NAAQS of...more

How Low Will They Go? A Lower Ozone NAAQS Begins to Have An Air of Inevitability

On Friday, EPA released its “Policy Assessment for the Review of the Ozone National Ambient Air Quality Standards.” EPA staff concluded: that it is appropriate in this review to consider a revised primary O3 standard level...more

9/4/2014  /  Air Quality Standards , EPA , NAAQS

EPA Inches Closer to a More Stringent Ozone Standard: When Will It Actually See the Light of Day?

On Monday, EPA released its second external review draft of an updated Policy Assessment on the national ambient air quality standard for ozone. It also released updated draft risk and exposure assessments. To no one’s...more

MassDEP Tightens TCE Indoor Air Regulation: The $64,000 Question? What About Closed Sites?

Last week, MassDEP released new guidance on how it is assessing exposures to TCE in light of EPA new assessment of TCE risks released in September 2011. The biggest issue is that concerns about fetal exposure have caused...more

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