Final Report REVIEW OF SOURCE APPORTIONMENT TECHNIQUES FOR AIRBORNE PARTICULATE MATTER Prepared for California Air Resources Board and the California Environmental Protection Agency
نویسنده
چکیده
ii Disclaimer The statements and conclusions of this Report are those of the contractor and not necessarily those of the California Air Resources Board. The mention of commercial products, their source, or their use in connection with material reported herein is not to be construed as actual or implied endorsement of such products. Abstract A review of source apportionment studies for airborne particulate matter reveals that unique chemical tracers are only available for a few general source categories including wood combustion, motor vehicle exhaust, coal combustion, meat cooking, crustaceous seafood cooking, candle combustion, tobacco smoke, and leaf abrasion. Unique chemical profiles can be constructed for many more sources, but their interpretation requires the uses of complex source apportionment models. Ten models that calculate the contribution that different sources make to air borne particulate matter are mathematical basis, assumptions, and limitations for each source apportionment model are summarized. The source apportionment methods are shown to provide a continuous spectrum of capabilities with increasingly detailed information provided as the amount of input data expands. A protocol to characterize source contributions to primary and secondary airborne particulate matter concentrations in a region of interest is recommended. Ambient data sets can first be analyzed using bilinear statistical models to identify approximate source identities and contributions. After important source profiles have been measured, linear statistical models can be applied to calculate source contributions to primary particulate matter at receptor locations. If regional source contributions to airborne particulate matter and / or source contributions to secondary particulate matter are important, emissions inventories can be developed for the region of interest and source-oriented chemical transport models can be used to identify important source contributions to these features of airborne particulate matter.
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