UT study debunks electric cars’ zeroemission ads Knoxville News Sentinel

12 Июн 2014 | Author: | Комментарии к записи UT study debunks electric cars’ zeroemission ads Knoxville News Sentinel отключены
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UT study debunks electric cars’ zero-emission ads

Electric cars have a dirty little secret.

Heavily advertised for their zero emissions, electric cars actually can expose people to more air pollution than gasoline cars, according to a University of Tennessee study published in the most recent edition of Environmental Science and Technology.

These nonsensical claims that (electric cars) have zero emissions are not true, said study author Chris Cherry, assistant professor in civil and environmental engineering.

The study focused on air quality in China, the world’s leader in electric vehicle use. It compared emissions like carbon dioxide and particulate matter from gasoline and diesel cars, diesel buses, electric bikes and electric cars in 34 Chinese cities. Particulate matter means tiny bits of acids, chemicals, dust and metal that can lodge deeply into the lungs.

The research team came up with a formula to measure per-passenger, per-kilometer exposure to emissions and particulate matter for each vehicle. To measure emissions for electric vehicles, they studied the power plants that produce the electricity.

The results? Diesel cars were the dirtiest, but electric cars were as dirty as diesel buses. Conventional cars were next, with electric bikes being the cleanest of all.

China has an estimated 100 million electric bikes purchased in the last decade.

Cherry cautioned that the results of his study are not necessarily true in the United States, where power plants that generate electricity tend to be much cleaner than those in China.

Still, all power grids in the U.S. use some form of fossil fuel, Cherry said, And therefore, electric vehicles are not zero-emissions.

Cherry also found that most power plants in China are outside the cities, while most electric vehicles are inside the cities.

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So you’re moving the pollution from the city to the rural area, said Cherry. Those people that are exposed are not necessarily the users of electric vehicles.

Cherry emphasized he’s not anti-electric vehicle.

I’m not trying to throw them under the bus, so to speak, he said. In the U.S. they’re certainly cleaner than they are in China. But we have bad air days in Knoxville, too.

If you plug in your electric vehicle, you’re basically pumping particulate matter out of the Kingston plant.

Cherry worked with UT graduate student Shuguang Ji and researchers from the University of Minnesota and Tsinghua University in Beijing on the study, funded by the National Science Foundation.


2012, Knoxville News Sentinel Co.

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