California EPA Exhaust Ozone 
Green Car Congress
SEPTEMBER 9, 2011
US EPA Region 9 8-hour ozone trends, 1979-2000. Source: EPA. These State Implementation Plans (SIPs) are the roadmaps to meeting the 1997 8-hour ozone National Ambient Air Quality Standards (NAAQS) of 0.08 In 1997, EPA first established the 8-hour ozone standard, which replaced the older 1-hour ozone standard (0.12
Green Car Congress
DECEMBER 23, 2016
Earlier this year, the US Environmental Protection Agency (EPA) received several petitions from state and local government agencies from across the country and other organizations to increase the stringency of the on-highway heavy-duty engine NO x emission standards from 0.2 —EPA memorandum in response to petitions.
Green Car Congress
JULY 25, 2009
Exposure to ozone at levels currently deemed safe by the NAAQS clean air standards can have a significant and negative effect on lung function, according to researchers at the University of California, Davis. Edward Schelegle, University of California, Davis. Earlier post.). Specifically, we found that 6.6
Green Car Congress
SEPTEMBER 26, 2009
The California Air Resources Board directed its staff to take steps to provide further locomotive and rail yard emission reductions beyond those achieved by existing US Environmental Protection Agency and state regulations and agreements. The emission reductions were to be beyond existing US EPA regulations and ARB regulations and agreements.
Green Car Congress
DECEMBER 4, 2013
earlier post ), found that emissions of NO 2 and other nitrogen oxides—which can have direct health effects and contribute to the formation of smog—were approximately 61% below the 2010 EPA standard and 99% lower than in 2004 engines. In 2010, EPA’s stringent NO x limit of 0.20 g/hp-hr in 2010.
Green Car Congress
FEBRUARY 5, 2020
Source of data: US EPA (2019). NO x is a precursor for both ground level ozone and secondary PM 2.5 EPA is targeting implementation in the 2027 timeframe while CARB is focusing efforts on phasing in more stringent standards in 2024 and again in 2027 with the hope of aligning with EPA as a national standard. Chart: MECA.
Green Car Congress
MAY 6, 2010
Testing is due to be complete next year, prompting the auto, oil and outdoor power equipment industries to urge the Environmental Protection Agency (EPA) to delay action on its proposal to allow higher levels of ethanol in gasoline until that testing is done. Exhaust emissions on vehicles aged on mid-level ethanol blends. Earlier post.)
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