Ultragiant Urban Aerosol Particles

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Science  26 Nov 1976:
Vol. 194, Issue 4268, pp. 941-942
DOI: 10.1126/science.194.4268.941


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.