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Exposures to Acidic Aerosols
J. D. Spengler, G. J. Keeler, P. Koutrakis, P. B. Ryan, M. Raizenne and C. A. Franklin
Environmental Health Perspectives
Vol. 79 (Feb., 1989), pp. 43-51
Published by: The National Institute of Environmental Health Sciences
Stable URL: http://www.jstor.org/stable/3430528
Page Count: 9
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Ambient monitoring of acid aerosols in four U.S. cities and in a rural region of southern Ontario clearly show distinct periods of strong acidity. Measurements made in Kingston, TN, and Steubenville, OH, resulted in 24-hr H+ ion concentrations exceeding 100 nmole/ m3 more than 10 times during summer months. Periods of elevated acidic aerosols occur less frequently in winter months. The H+ determined during episodic conditions in southern Ontario indicates that respiratory tract deposition can exceed the effects level reported in clinical studies. Observed 12-hr H+ concentrations exceeded 550 nmole/ m3 (approximately 27 μ g/ m3 H2 SO4). The maximum estimated 1-hr concentration exceeded 1500 nmole/ m3 for H+ ions. At these concentrations, an active child might receive more than 2000 nmole of H+ ion in 12 hr and in excess of 900 nmole during the hour when H2 SO4 exceeded 50 μ g/ m3.
Environmental Health Perspectives © 1989 The National Institute of Environmental Health Sciences