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EPA proposes tightening primary ozone standards to range of 65-70 ppb; final rule by October 2015

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Counties where measured ozone is above proposed range of standards, based on 2011-2013 monitoring data. Earlier this year, EPA staff had recommended the further reduction of this primary ozone standard from the current 75 ppb (parts per billion) to a revised level within the range of 70 ppb to 60 ppbā€”and preferably below 70 ppb.

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Study: ozone levels higher across China than in other countries tracking the air pollutant

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In China, people breathe ozone-laden air two to six times more often than people in the United States, Europe, Japan, or South Korea, according to a new international study published in Environmental Science & Technology Letters. 2017 for one ozone metric. The inset shows ozone trends in Beijing (red) and Los Angeles (blue).

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Obama Administration withdraws proposed rulemaking on strengthened ozone standards

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In a statement released this morning, President Barack Obama said he has requested that US Environmental Protection Agency (EPA) Administrator Lisa Jackson withdraw the agency’s draft Ozone National Ambient Air Quality Standards (NAAQS) rulemaking. National Ambient Air Quality Standards (NAAQS). Earlier post.)

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CARB releases results of multi-year E15 study; multiple air quality benefits with slight reduction in fuel economy

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The California Air Resources Board (CARB) has released the results of a multiyear study evaluating exhaust emissions from the use of California Reformulated Gasoline (CaRFG) that contains 15 volume percent ethanol (E15). The study used two fuels—an E10 and E15. SULEV30, ULEV50, ULEV70, and ULEV125).

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CARB staff proposing amendments to Fill Pipes specs for gasoline-fueled cars

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The staff of the California Air Resources Board (CARB) is proposing amendments to the Fill Pipes Specifications to help ensure new motor vehicle fill pipes continue to be compatible and to form a good seal with Phase II recovery nozzles that are certified for use at California gasoline stations, thereby reducing overpressure.

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EPA to begin work on proposed rulemaking for on-road heavy-duty ultra-low NOx standard for MY 2024

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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 grams per brake horsepower-hour (g/bhp-hr) to 0.02

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Latest GHG Inventory shows California remains below 2020 emissions target; much steeper rate of GHG reductions required

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The California Air Resources Board released GHG emissions data for 2018 showing that emissions remain below 1990 levels but are effectively flat compared to 2017, while the economy grew by 4.3%. Source: California Air Resources Board (ARB). Total statewide 2018 GHG emissions were 425.3 million metric tons, compared to 424.5

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