Scaling Relationship for NO2 Pollution and Urban Population Size: A Satellite Perspective(Abstract, L. N. Lamsal, R. V. Martin, D. D. Parrish, and N. A. Krotkov, Environmental Science and Technology, Jun. 13, 2013)
Also quoted here: Scientists Relate Urban Population to Air Pollution(Science Daily, Aug. 19, 2013)
Today we review a new look at the relationship between the size of cities and the level of air pollution world-wide, as estimated from satellite measurements of nitrogen dioxide, whose main source is vehicle emissions. Although there were regional differences, the pollution more than doubled when a city’s population increased from 1 to 10 million and even more (by a factor of 5) in China with its large number of new megacities. This result has major implications for urban planning of developing large cities, especially where vehicle emissions is a major contributer to that pollution and little is being done to limit them.
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