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Science 5 January 2007:
Vol. 315. no. 5808, pp. 50 - 51
DOI: 10.1126/science.1136529
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Perspectives

ATMOSPHERE:
Aerosols Before Pollution

Meinrat O. Andreae

No unpolluted regions remain in today's atmosphere. How can we estimate the aerosol content of the atmosphere before there was human activity?

The author is at the Max Planck Institute for Chemistry, 55020 Mainz, Germany. E-mail: andreae{at}mpch-mainz.mpg.de

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