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US EPA to Reconsider National Ozone Standards

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The US Environmental Protection Agency (EPA) will reconsider the 2008 primary and secondary ozone standards. In 2008, EPA established a new primary 8-hour standard for ozone of 0.075 parts per million (ppm), and a new secondary standard set at a form and level identical to the new primary standard. ppm standard, due to rounding.

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EPA says methane emissions from natural gas production have dropped 36% from 2007-2011

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In its recently released Inventory of US Greenhouse Gas Emissions and Sinks: 1990 – 2011 ( earlier post ), the US Environmental Protection Agency (EPA) reported that methane (CH 4 ) emissions from the field production of natural gas have declined by 36% from 2007 to 2011 (from 83.1 Tg or million metric tons CO 2 equivalent.)

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Study Finds Ozone Concentrations at Current Clean Air Standards Levels Can Impair Even Healthy Lungs

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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. The previous primary and secondary standards were identical 8-hour standards, set at 0.08 Earlier post.).

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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. The Health Effects Institute is an independent, non-profit research institute funded jointly by government and industry to provide credible, high quality science on air pollution and health for air quality decisions. Source: CRC. Click to enlarge.

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WMO: Atmospheric Concentrations of Main Greenhouse Gases in 2008 Set New Highs

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ppb—higher than those in pre-industrial times (before 1750) by 38%, 157% and 19%, respectively. from 2007 to 2008. Its atmospheric abundance was nearly constant at about 280 ppm before industrialization. Before the industrial era, atmospheric methane was about 700ppb. ppm, CH 4 at 1,797 ppb and N 2 O at 321.8

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UN Review of Recent Climate Research Concludes That Impacts Of Climate Change Coming Faster Than Anticipated

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The growth in carbon dioxide emissions from energy and industry has exceeded even the most fossil-fuel intensive scenario developed by the IPCC at the end of the 1990s. per year from 2000-2007. degrees Centigrade above pre-industrial surface temperatures could occur. degrees Celsius, above pre-industrial surface temperatures.

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EPA Issues Proposed Endangerment Finding for Greenhouse Gases; Proposed Cause or Contribute Finding Identifies Motor Vehicles as Contributing Source

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After a thorough scientific review ordered in 2007 by the US Supreme Court, the US Environmental Protection Agency (EPA) issued a proposal with two distinct findings regarding greenhouse gases. Climate change has the potential to produce increases in ground-level ozone in many regions, according to the report.

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