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Researchers report on potential long-range atmospheric emissions impacts of increased ethanol fuel use in North America

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Seasonal ethanol emissions from North America. Emissions for present-day are compared to those for the EISA and All-E85 scenarios. Terrestrial plants are thought to be the dominant global source of atmospheric ethanol.) Emissions from the continental US increase by 3.4× Labels at left are months (e.g., Click to enlarge.

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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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Contributions of regions to total life cycle emissions for three fuels (µg per vehicle-mile traveled per km 2 land area). Dashed lines show US average emissions. Associated tailpipe emissions alone account for 40?60% Credit: ACS, Tessum et al. Click to enlarge.

Gasoline 236
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Study finds that cities with highly contiguous built-up areas have on average lower NO2 concentrations

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In the first empirical study using satellite measurements to explore the relationship between urban form and air pollution, a team from the University of Minnesota has found that cities with highly contiguous built-up areas have, on average, lower concentrations of nitrogen dioxide (NO 2 , a key component of urban air pollution).

Pollution 225
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Study finds modifying urban form may be a strategy to reduce air pollution

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Based on their findings in a new study, researchers from the University of Washington and the University of Minnesota suggest that modifying urban form—as a means of affecting motor vehicle usage—may be a strategy to mitigate urban air pollution. Their paper appears in the ACS journal Environmental Science & Technology.

Pollution 231
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Study finds that environmental impact of corn-ethanol E85 is 23% to 33% higher than that of gasoline; environmental problem-shifting

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GW = global warming; Eut. eutrophication; ET = ecological toxicity; FEC = fossil energy consumption; WU = water use; LO = land occupation; “The rest” includes acidification; smog formation; ozone layer depletion; and human health effects. Environmental impacts of gasoline and E85. Error bar shows regional variations for E85.

Gasoline 357