Figure 1 - Megacity aerosols.

From the following article

Atmospheric science: Black carbon and brown clouds

John Seinfeld

Nature Geoscience 1, 15 - 16 (2008)

doi:10.1038/ngeo.2007.62

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Los Angeles smog layer on 29 January 2004. The satellite-derived annual mean aerosol optical depth over Los Angeles from 2001–2003 was about 0.3, classifying the city as a regional aerosol hot spot. Los Angeles was one of 26 megacities evaluated by Ramananthan and colleagues1.

ALAN CLEMENTS

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