Exposures to acidic aerosols.

Abstract:

: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 micrograms/m3 H2SO4). 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 H2SO4 exceeded 50 micrograms/m3.

authors

Spengler JD,Keeler GJ,Koutrakis P,Ryan PB,Raizenne M,Franklin CA

doi

10.1289/ehp.897943

subject

Has Abstract

pub_date

1989-02-01 00:00:00

pages

43-51

eissn

0091-6765

issn

1552-9924

journal_volume

79

pub_type

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