NOx
Cars, Smog, and EPA
Over the past fifty years, EPA has overseen incredible reductions in auto pollution.
This is part of an occasional series of posts about the evolution of pollution standards. Today’s subject is pollution control for new vehicles, which have been known to cause smog since the 1960s. The history of these pollution standards is quite distinctive. At the high temperatures in internal combustion engines, some of the nitrogen in …
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CONTINUE READINGKeep on Trucking
A new rule will clean up exhaust from new diesels, a major health threat.
Last week, EPA finalized its new rule imposing emission limits on new heavy trucks. The new regulation was clearly a massive undertaking. EPA’s formal announcement of the new rule is 1100 pages long. The accompanying summary of comments on the proposed rule and EPA’s responses is another 2000 pages. This is partly due to the …
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CONTINUE READINGCutting Through the Smog
New research highlights the importance of reducing ozone pollution and suggests ways to do it.
As a change of pace, here’s a post that’s not about Trump, Pruitt, or their friends in Congress. Two recent papers highlight the importance of EPA’s tightening of the air quality standard for ozone and suggest some ways of doing so that could be more acceptable to industry. (We’re talking about ground-level smog here, not …
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CONTINUE READINGDon’t Knock EPA’s Knack for NAAQS
On Tuesday, the D.C. Circuit decided American Petroleum Institute (API) v. EPA, an interesting case dealing with nitrogen oxide (NO2) levels. The standard is supposed to include a margin of safety.Under the Clean Air Act, EPA sets National Ambient Air Quality Standards (NAAQS) for airborne substances that endanger human health or welfare. EPA set such …
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CONTINUE READINGCalifornia Supreme Court decides in favor of accurate environmental impact analysis (and cleaner air)
The California Supreme Court just issued an important decision interpreting public agencies’ obligations under the California Environmental Quality Act. This case will result in cleaner air in southern California. It also establishes that public agencies must measure environmental impacts from a new project against actual existing conditions, rather than against theoretical conditions (based on permits …
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