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The definitive CO2/CH4 comparison post

Real Climate

The radiative forcing from these changes in concentrations can be easily calculated using standard formulas (from Etminan et al, 2016 which supersede the slightly simpler ones from IPCC TAR), as about 2 W/m 2 for the CO 2 change and 0.65 W/m 2 for CH 4. W/m<sup>2</sup> (to about 60% of the CO 2 effect since 1750).

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Minnesota Can Do More to Protect People from Ethylene Oxide Emissions

Union of Concerned Scientists

EPA’s own scientists concluded in 2016 that the risk value of ethylene oxide is 60 times more toxic than previously understood. You can compare this to ozone which has a half-life on the order of minutes, and some PFAS chemicals that have a half-life in air on the order of several years.

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Deciphering the ‘SPM AR6 WG1’ code

Real Climate

I think in hindsight that my concerns from 2013 to some extent were supported by the fact that the IPCC organised an Expert Meeting on Communication, Oslo, Norway, 9–10 February 2016. In addition, ozone depletion higher up in the stratosphere has caused a cooling high up in the atmosphere.

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Air Regulators Tackle Trucking at Southern California Warehouses

Clean Energy Law

The rule includes a sunset date, whereby the WPCO requirement expires after both an EPA finding that all SCAQMD air basins have attained the federal 2015 ozone standard of 70 parts per billion (ppb) and a CARB finding that all SCAQMD air basins have attained the state ozone standard of 70 ppb. Further Actions.

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Improving EPA’s Latest Ozone Transport Rule

Acoel

The proposed rule would provide de minimus air quality benefits in downwind areas with extremely high costs – estimated by EPA at $22 billion discounted 2016 dollars for the 2023-2042 period. The agency’s air quality modeling indicates that most areas would receive an ozone reduction of less than 0.1 ppb by 2025.

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Air District Targets Southern California Logistics Industry

Clean Energy Law

The Basin does not meet the state or federal ambient air quality standards for ozone and particulate matter, and existing regulations have to date proved insufficient to bring the Basin into compliance. According to the 2016 AQMP, mobile sources contributed about 88% of total NO x emissions in the Basin in 2012.

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China displays low-carbon tech at the Winter Olympics?

A Greener Life

This is replacing the traditional hydrofluorocarbons which have been found to damage the ozone layer. Total greenhouse gas emissions could reach 1.028 million tonnes of CO2 equivalent throughout the preparation and post-Beijing Games in 2016-2022, and about a third less than the 1.6