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Science 26 November 1976:
Vol. 194. no. 4268, pp. 941 - 942
DOI: 10.1126/science.194.4268.941
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Articles

Ultragiant Urban Aerosol Particles

DAVID B. JOHNSON 1

1 Cloud Physics Laboratory, Department of Geophysical Sciences, University of Chicago, Chicago, Illinois 60637

Measurements taken 300 meters above ground level show surprisingly high concentrations of ultragiant aerosol particles both upwind and downwind of the St. Louis, Missouri, urban area. Assuming an average particle density of 2.0 grams per cubic centimeter, concentrations of particles with diameters between 5 and 55 micrometers sampled on 11 different days averaged 31 micrograms per cubic meter upwind and 55 micrograms per cubic meter downwind of the city.

Submitted on July 28, 1976
Revised on September 21, 1976

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Science. ISSN 0036-8075 (print), 1095-9203 (online)