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Satellite data show resurgence in NO2 emissions over China

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The satellite carries the Tropomi instrument to map a multitude of trace gases such as nitrogen dioxide, ozone, formaldehyde, sulfur dioxide, methane, carbon monoxide and aerosols. ©ESA/ATG Sentinel-5 Precursor is the first Copernicus mission dedicated to monitoring the atmosphere. ©ESA/ATG medialab.

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NASA GISS Study Finds That Methane Has an Elevated Warming Effect Due to Interactions With Aerosols

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In particular, the study led by Drew Shindell found that methane emissions have a larger warming impact due to those interactions than accounted for in current carbon-trading schemes or in the Kyoto Protocol. And hydroxyls drive long chains of reactions involving other common gases, including ozone. Shindell et al.

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US and UK researchers report direct measurement of key atmospheric reactant; more rapid formation of secondary aerosols

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Ozonolysis—the cleavage of carbon-carbon double bonds through reaction with ozone—is a reaction that plays a key role in a number of fields, including synthetic chemistry and tropospheric removal of unsaturated hydrocarbons. —Welz et al. In a commentary accompanying the main paper by Welz et al. , Welz et al.

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Berkeley study identifies diesel as main source of vehicular secondary organic aerosols

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The use of petroleum-derived fuels is an important source of reactive gas-phase organic carbon that provides key precursors to the formation of secondary OA (SOA) and tropospheric ozone. These compounds in un-burned gasoline and diesel fuel dominate vehicular emissions of reactive gas-phase carbon that have the potential to form SOA.

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Study finds modifying urban form may be a strategy to reduce air pollution

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Transportation is one of the largest contributors to urban air pollution for pollutants such as carbon monoxide, nitrogen oxides, benzene, ozone, and fine particulate matter (PM 2.5 ). As such, cities are a focal point for understanding and addressing environmental health issues. is attributable to motor vehicles.

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Researchers describe the “where” and “when” of life cycle emissions from gasoline and ethanol in the US

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60% of ground-level ozone (O 3 ) precursors, 6% of fine particulate matter (PM 2.5 ), and 22% of greenhouse gases (GHGs) emitted. of all three fuels, but emits more black carbon (15 mg mi ?1 On-road transportation accounts for approximately 20% of United States energy consumption. Associated tailpipe emissions alone account for 40?60%

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Researchers Determine Process Through Which Hydrocarbon Compounds Emitted by Trees Form Aerosols, With Impact on Human Health and Climate

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Isoprene, a five-carbon diene formed naturally in plants and animals and a precursor of ozone, contributes more than 40% of these emissions. Global simulations show an enormous flux—nearly 100 teragrams of carbon per year—of these epoxides to the atmosphere. Paul Wennberg, Caltech, project leader.