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Science 30 October 2009:
Vol. 326. no. 5953, pp. 674 - 675
DOI: 10.1126/science.1176064
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Perspectives

Climate Change:

Clean Air for Megacities

David D. Parrish1 and Tong Zhu2

As of 2008, over half of humanity lives in cities. The number of megacities (with populations over 10 million) grew from 3 in 1975 to 19 in 2007, and is projected to increase to 27 in 2025 (1). These megacities are the engines of growing economies, but are also very large sources of air pollutants and climate-forcing agents. The growth of megacities greatly aggravates the health impacts of polluted air, yet it may also provide an opportunity to mitigate climate change, if implemented air quality policies are designed to also reduce global warming.

1 Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305, USA.
2 State Key Lab for Environment Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.

E-mail: tzhu{at}pku.edu.cn

E-mail: david.d.parrish{at}noaa.gov

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Clean the Air, Heat the Planet?.
A. Arneth, N. Unger, M. Kulmala, and M. O. Andreae (2009)
Science 326, 672-673
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Science. ISSN 0036-8075 (print), 1095-9203 (online)