Record Display for the EPA National Library Catalog

RECORD NUMBER: 25 OF 44

Main Title National Air Surveillance Cascade Impactor Network. III. Variations in Size of Airborne Particulate Matter Over Three-Year Period.
Author Lee, Jr., Robert E. ; Goranson., Stephen ;
CORP Author Health Effects Research Lab., Research Triangle Park, N.C.
Year Published 1975
Report Number EPA/600/J-76/058;
Stock Number PB-267 875
Additional Subjects Particle size distribution ; Automobiles ; Aerosols ; Impactors ; Sampling ; Exhaust emissions ; Fines ; Cascade impactors ; Air pollution sampling ; Reprints
Holdings
Library Call Number Additional Info Location Last
Modified		 Checkout
Status
NTIS  PB-267 875 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 8p
Abstract
A cascade impactor network operating from 1970 through 1972 at eight urban and two nonurban sites indicated that the median size of airborne particles on a mass basis appeared to increase over the sampling period. Quarterly variations in the median size were associated with seasonal changes, decreasing in summer but increasing in winter. The general upward trend in the size of airborne particles appeared to be associated with the reduction in automotive emissions that can lead to the formation of fine, secondary aerosols. Other possible explanations, however, were examined in addition to an evaluation of the limitations of the cascade impactor used in the network.