What Links the Population of Large Cities and Air Pollution?


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.

city pop and aq

To see Key Quotes and Links to key reports about this post, click HERE

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