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Some Evidence that Deference to Agency Technical Decisions May Survive Loper-Bright

Late last month, I noted that the overturning of Chevron did not mean the end of judicial deference to agency expertise. Earlier this week, a decision by the D.C. Circuit Court of Appeals provided some confirmation that...more

The D.C. Circuit Affirms EPA’s Reinstatement of California’s Authority to Set Auto Emissions Limits; Don’t Get Too Excited About...

On Tuesday, in Ohio v. EPA, the D.C. Circuit Court of Appeals denied several challenges to EPA’s decision to restore California’s authority under § 209(b) of the Clean Air Act to regulate emissions from motor vehicles. It’s...more

The D.C. Circuit Vacates Most of EPA’s SSM SIP Call; Generators Breath a Sigh of Relief

Earlier this month, the District of Columbia Court of Appeals vacated most of EPA’s startup, shutdown, and malfunction SIP Call. The Court’s rationale boils down to EPA’s failure to make a predicate finding that the SIP call...more

EPA Lowers the PM2.5 NAAQS: Goldilocks Can Sleep Soundly

On February 7, 2024, EPA finalized a rule lowering the primary annual National Ambient Air Quality Standard for PM2.5 to 9.00 ug/m3.  This is a significant reduction from the current 12.00 ug/m3 standard and a victory for...more

Another Study Regarding the Health Impacts of PM Emissions From Power Plants: What Impact Will It Have On Regulation and...

An article in Science published last week indicates that the mortality risk from exposure to PM2.5 from coal-fired electric generating units is roughly twice as high as the risk posed by PM2.5 from other sources.  According...more

Establishing Standing in Citizen Suits Under the Clean Air Act: Breathing Polluted Air May Not Suffice

Earlier this month, Judge William Young dismissed for lack of standing claims brought by the Conservation Law Foundation alleging that bus companies violated anti-idling regulations.  The opinion is important, because it does...more

Deja Vu One More Time? What Will Happen If EPA Ignores CASAC Regarding the Ozone NAAQS?

Last week, Inside EPA (subscription required) reported that the Clean Air Science Advisory Committee has pretty much agreed that the National Ambient Air Quality Standards for ozone must be made more stringent. Apparently,...more

It’s More Important for EPA to Ensure that States Are Good Neighbors Than That They are Perfect Neighbors

Last week, D.C. Circuit Court of Appeals rejected challenges to EPA’s “Revised Cross-State Air Pollution Update Rule”. The Court found that the Rule was “an appropriate exercise of EPA’s statutory authority”....more

May A Court Take Judicial Notice of Gravity?

Earlier this month, United States District Court Judge Stephen Wilson held that NL Industries was not liable under CERCLA for air emissions of lead because such emissions did not constitute “disposal” within the meaning of...more

News Flash! International Cooperation on the Environment Remains Possible

In these times of much woe, it’s always noteworthy when the mainstream media reports good news. Especially when it’s good news about effective international cooperation on environmental protection issues....more

EPA Proposes to Lower the PM2.5 NAAQS — Searching For the Goldilocks Level

EPA has finally proposed revisions to the national ambient air quality standard for PM2.5. The Administrator is proposing to lower the standard from 12.0 ug/m3 to a range of 9.0 to 10.0 ug/m3....more

Noise Isn't an Inconvenience; It's a Pollutant

I used to think that noise was something that grumpy old men complained about. Then I became a grumpy old man. And now I realize that noise really is a pollutant. And so I was pleased to see The Effects of Noise on Health. ...more

Boston Promulgates BERDO “Phase I” Regulations: Emissions Standards For Buildings Are Coming Soon

The Boston Air Pollution Control Commission has formally adopted its “Building Emissions Reduction and Disclosure Ordinance Phase 1 Regulations.” The Phase 1 regulations are really all about the “disclosure” side of BERDO. ...more

The Impact of Exposure to Leaded Gasoline Was Horrific: Will We Say the Same in 2050 About the Impact of PM2.5 Exposure?

An article in the Proceedings of the National Academy of Sciences (login required) has documented the devastating impact caused by the use of leaded gasoline. The study estimates that more than half of Americans alive in...more

DOJ Gets Off Its Moral High Horse: Ameren Missouri Will Close Early

In January, I noted that Ameren Missouri had surrendered in its defense of the NSR enforcement action brought by DOJ with respect to the Rush Island generating facility.  Ameren Missouri submitted to the Court a proposal to...more

It’s Still (Again) Necessary and Appropriate to Regulate Air Toxics From Power Plants

EPA has proposed to revoke the Trump administration finding in 2020 that it is not appropriate and necessary to regulate emissions of air toxics from coal- and oil-fired electric generating units.  Instead, EPA proposes to...more

BERDO Implementation Picks Up Speed — Better Get Ready

On Monday, Boston released a draft of the first phase of regulations intended to implement the amended BERDO ordinance signed by then-Mayor Janey in October. The first phase of the regulations is focused only on reporting...more

The Internal Combustion Engine Is Bad For Your Health — What Should We Do About It?

I’ve written a lot about how the developing science around particulate exposure supports making the PM2.5 NAAQS more stringent. So it won’t come as a surprise that a new study published in the Proceedings of the National...more

CASAC Signals that a Lower PM2.5 NAAQS Is On the Way; It Can’t Come Too Soon

The momentum continues to build for a more stringent National Ambient Air Quality Standard for PM2.5. In June, EPA announced it would revisit the Trump Administration’s decision to keep the PM2.5 NAAQS at 12 ug/m3. In early...more

Boston Regulates Building GHG Emissions: The Next Few Years Will Be Very Interesting

Last week, the Boston City Council approved amendments to the Building Energy Reporting and Disclosure Ordinance. The changes are being referred to as “BERDO 2.0”, which almost understates the scope of the revisions. As...more

EPA Is Reconsidering the PM2.5 NAAQS. The Sooner, the Better.

EPA announced yesterday that it will “reconsider” the Trump EPA’s decision not to change the PM2.5 National Ambient Air Quality Standard. I’ve blogged numerous times about the growing body of evidence that exposure to...more

PM2.5 and Environmental Justice - and Electric Vehicles– and Tires

I’ve frequently discussed in recent years the mounting evidence for the need to lower the National Ambient Air Quality Standard for PM2.5. There is also substantial evidence that PM exposure is an environmental justice issue....more

Have I Mentioned that PM2.5 Is Bad For You?

The evidence of the harm resulting from PM2.5 exposures keeps rolling in. Earlier this month, Environmental Research published an article titled “Global mortality from outdoor fine particle pollution generated by fossil fuel...more

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...more

EPA’s Ozone NAAQS Decision — Perhaps the Statute Itself Deserves Some of the Blame

On December 23, 2020, EPA formalized its decision to leave the ozone NAAQS unchanged, at 70 ppb. I don’t think that this decision is in the same category of egregiousness as EPA’s recent decision not to reduce the PM2.5...more

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