| Main Title |
Exposures to Acidic Aerosols. |
| Author |
Spengler, J. D. ;
Keeler, G. J. ;
Koutrakis, P. ;
Ryan, P. B. ;
Raizenne, M. ;
|
| CORP Author |
Harvard School of Public Health, Boston, MA. ;Environmental Health Directorate, Ottawa (Ontario).;Health Effects Research Lab., Research Triangle Park, NC. |
| Publisher |
c1989 |
| Year Published |
1989 |
| Report Number |
EPA/600/J-89/452; |
| Stock Number |
PB91-109447 |
| Additional Subjects |
Aerosols ;
Air pollution ;
Exposure ;
Seasonal variations ;
Respiratory system ;
Children ;
Ontario ;
Urban areas ;
Sulfuric acid ;
Reprints ;
Air pollution monitoring ;
Hydrogen ions ;
Kingston(Tennessee) ;
St Louis(Missouri) ;
Steubenville(Ohio) ;
Portage(Wisconsin)
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB91-109447 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
11p |
| 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/cu m 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/cu m (approximately 27 microgram/cu m H2SO4). The maximum estimated 1-hr concentration exceeded 1500 nmole/cu m 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 microgram/cu m. |
