Record Display for the EPA National Library CatalogRECORD NUMBER: 6 OF 14
|Main Title||Comparison of Aerosol Acidity in Urban and Semi-Rural Environments.|
|Author||Burton, R. M. ; Wilson, W. E. ; Koutrakis, P. ; Liu, L. J. S. ;|
|CORP Author||Harvard School of Public Health, Boston, MA.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.|
|Report Number||EPA-R-81-6740; EPA/600/A-92/278;|
|Additional Subjects||Air pollution sampling ; Aerosols ; Acidity ; Comparison ; Hydrogen sulfide ; Pennsylvania ; Environmental transport ; Urban areas ; Ammonia ; Concentration(Composition) ; Coking ; Ammonium sulfate ; Rural areas ; Pollution sources ; Chemical reactions ; Oxidation ; Sulfates ; Pittsburgh(Pennsylvania) ; Uniontown(Pennsylvania) ; State College(Pennsylvania)|
During the summer of 1990, acid aerosol, acid gas, and ammonia measurements were conducted simultaneously at three locations in central and western Pennsylvania where population levels were large (metropolitan Pittsburgh) and small (semi-rural communities of Uniontown and State College). Aerosol acidity was found to be lower in the urban area than in the two semi-rural locations. On the constrast, ammonia levels were higher in the urban environment than in the semi-rural environments. Possible sources of ammonia in Pittsburgh are people residing in the city or the two coke plants located upwind of the Pittsburgh sampling site. A mixture of totally and partially neutralized sulfates, i.e., (NH4)2SO4 and NH4HSO4, were the dominating sulfur species in Pittsburgh while in State College and Uniontown, the primary sulfur species were H2SO4 and NH4HSO4.