Record Display for the EPA National Library CatalogRECORD NUMBER: 9 OF 9
|Main Title||Significance of Regional Source Contributions to Urban PM-10 (Nominal 10 Micrometers) Concentrations.|
|Author||Batterman, S. A. ; Fay, J. A. ; Golomb, D. ;|
|CORP Author||Massachusetts Inst. of Tech., Cambridge. Energy Lab.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab.|
|Additional Subjects||Air pollution ; Sources ; Urban areas ; Sulfates ; Air quality control regions ; Air quality ; Air pollution standards ; Cities ; St Louis(Missouri) ; Philadelphia (Pennsylvania)|
Based on data collected in St. Louis, Philadelphia and other cities, this evaluation concludes that about 50-80% of the PM-10 concentrations is 'background.' The bulk of the background appears to be of regional origin. The chemical makeup of the background is sulfate as SO4, 21-34%; crustal material, 14-36%; 'unknown' (carbonaceous matter, ammonium, nitrate and water), 36-51%. Dispersion or receptor modeling using a local source inventory or elemental signatures can account only for the incremental contributions from local sources to the total PM-10 mass. It is argued that emission roll-back of local sources will have a limited effect on reducing total concentrations of PM-10.