Chinese traffic cuts reduce air pollution

May 3, 2007

Restrictions on Beijing motorists during a three-day period last November significantly reduced smog and airborne pollutants.

Chinese officials, in what was viewed as a rehearsal for the 2008 Summer Olympics, imposed restrictions that resulted in approximately 800,000 of Beijing's 2.8 million vehicles being taken off the road. The result, according to a U.S. study, was a 30 percent reduction in the city's traffic volume and a resulting 40 percent decrease in nitrous oxide emissions.

Harvard University researchers Michael McElroy, Yuxuan Wang and K. Folkert Boersma used data from the National Aeronautics and Space Administration's Aura satellite to assess the drop in emissions.

"I don't think a proper analysis has ever been made before of such a remarkable shift of environmental policy in such a short period of time," said McElroy, a professor of environmental studies.

China's restrictions on Beijing drivers coincided with the Forum on China-Africa Cooperation, held in Beijing Nov. 4-6.

Wang, a Harvard postdoctoral fellow, said, "We expected a drop in nitrogen emissions, but not to this extent, and after only a short period of time."

The scientists detail their research in the current issue of the journal Geophysical Research Letters.

Copyright 2007 by United Press International

Explore further: Scientists find social media provides proxy measurement of pollution 

Related Stories

Beijing releases pollution data; US figures higher

January 21, 2012

(AP) -- Caving to public pressure, Beijing environmental authorities started releasing more detailed air quality data Saturday that may better reflect how bad the Chinese capital's air pollution is. But one expert says measurements ...

What leaves the citizens of Beijing breathless

December 16, 2015

This week's smog alarm at Beijing underlines the relevance of air pollution in the Chinese capital. Researchers of Karlsruhe Institute of Technology (KIT) have been studying factors influencing air quality in the megacity ...

Recommended for you


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.