Relating particulate pollution to sources: The 1972 California aerosol characterization study

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Abstract

The pollution aerosol is composed of a mixture of natural background material, solids and liquids introduced into the atmosphere from man-made sources and the products of certain gas-to-particle transformation processes. The relative contributions of various types of sources to the primary and secondary aerosol can be estimated from the chemical composition and emission inventories. More detailed information on size and chemical element-distributions is obtained by making coagulation and growth calculations. Contributions of different sources to visibility degradation can be estimated from changes in light scattering produced by the various components.

The methodology has been applied to chemical and physical data averaged over 2 h sampling periods in Pasadena (20 September 1972) and Pomona (24 October 1972). The mass contributions of various sources to the total paniculate pollution in Fresno. San Jose and Riverside have also been estimated based on chemical element balances and source inventories. Measurements were made during the summer and Fall of 1972. Visibility deterioration in Pasadena and Pomona can be largely ascribed to nitrates sulfates organics and ammonia converted from the gas phase, together with water.

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