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EPA, NHTSA issue One National Program Rule; EPA withdraws CA waiver for GHG and fuel economy

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Specifically, in this action, NHTSA is affirming that its statutory authority to set nationally applicable fuel economy standards under the express preemption provisions of the Energy Policy and Conservation Act (EPCA) dictates that such state and local programs are preempted. Earlier post.)

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Study associates long-term exposure to air pollution with increasing emphysema

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Long-term exposure to ambient air pollutants, especially O 3 (ozone), is significantly associated with increasing emphysema, according to a new study led by the University of Washington, Columbia University and the University at Buffalo. The annual averages of ozone levels in study areas were between about 10 and 25 ppb.

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California 2017 GHG inventory shows 1.2% total drop from 2016; transportation sector emissions up 1%

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Transportation sector emission sources include combustion of fuels utilized in-state that are used by on-road and off-road vehicles, aviation, rail, and water-borne vehicles, as well as a few other smaller sources. The transportation sector remains the largest source of GHG emissions in the state, and saw a 1% increase in emissions in 2017.

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CRC ACES Phase 2 report finds emissions from modern heavy-duty diesels well below required levels

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2010 engines emissions reduction relative to 2010, 2007, and 2004 US emission standards. g/hp-hr between 2007 and 2009 to a level less than or equal to 0.20 Source: CRC. Click to enlarge. For a number of the most important pollutants, levels were substantially lower than required by regulations. Background. g/hp-hr in 2010.

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Researchers report on potential long-range atmospheric emissions impacts of increased ethanol fuel use in North America

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We then employ this revised source estimate as a baseline for assessing some potential large-scale impacts of changing ethanol fuel use in the US. The researchers then applied these estimates to analyzing two scenarios for increased ethanol fuel use in the US: A complete transition from gasoline to E85 (85% ethanol) fuel.

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Study finds changes in the Arctic sea ice cover may be driving changes in atmospheric chemistry

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Bromine also can remove ozone from the lowest layer of the atmosphere, the troposphere. Despite ozone’s beneficial role blocking harmful radiation in the stratosphere, ground-level ozone is a harmful pollutant. Bromine then reacts with a gaseous form of mercury, turning it into a pollutant that falls to Earth’s surface.

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California Air Resources Board Unveils $3.7M in Rebates for Plug-in Hybrid and Zero-Emission Vehicles

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million program that Governor Schwarzenegger approved in 2007 to spur technological innovation in the transportation sector. battery electric or fuel cell) and plug-in hybrid light-duty vehicles and up to $20,000 for the purchase of ARB-certified or approved zero-emission commercial vehicles on a first-come, first-served basis.

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