Temporal changes in U.S. benzene emissions inferred from atmospheric measurements.
Environ Sci Technol
; 39(6): 1403-8, 2005 Mar 15.
Article
en En
| MEDLINE
| ID: mdl-15819191
ABSTRACT
The 1990 Clean Air Act Amendments required the United States Environmental Protection Agency (U.S. EPA) to enact stricter regulations aimed at reducing benzene emissions. In an effort to determine whether these new regulations have been successful in reducing atmospheric benzene concentrations, we have evaluated benzene-to-acetylene ratios from data sets spanning nearlythree decades, collected during several field studies and from the U.S. EPA's Photochemical Assessment Monitoring Station (PAMS) network. The field-study data indicate a decrease in benzene relative to acetylene of approximately 40% from 1994 to 2002. This corresponds to a decrease in benzene alone of approximately 56% over the same period. In contrast, the PAMS data exhibit high interannual variability with no discernible trend. This discrepancy is attributed to measurement problems in the PAMS data sets.
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Bases de datos:
MEDLINE
Asunto principal:
Benceno
/
Contaminantes Atmosféricos
País/Región como asunto:
America do norte
Idioma:
En
Revista:
Environ Sci Technol
Año:
2005
Tipo del documento:
Article
País de afiliación:
Estados Unidos