| Title: | Source apportionment: findings from the U.S. Supersites Program |
| Author(s): | Watson JG; Chen LW; Chow JC; Doraiswamy P; Lowenthal DH; |
| Address: | "Division of Atmospheric Sciences, Desert Research Institute, Reno, NV 89512, USA. john.watson@dri.edu" |
| DOI: | 10.3155/1047-3289.58.2.265 |
| ISSN/ISBN: | 1096-2247 (Print) 1096-2247 (Linking) |
| Abstract: | "Receptor models are used to identify and quantify source contributions to particulate matter and volatile organic compounds based on measurements of many chemical components at receptor sites. These components are selected based on their consistent appearance in some source types and their absence in others. UNMIX, positive matrix factorization (PMF), and effective variance are different solutions to the chemical mass balance (CMB) receptor model equations and are implemented on available software. In their more general form, the CMB equations allow spatial, temporal, transport, and particle size profiles to be combined with chemical source profiles for improved source resolution. Although UNMIX and PMF do not use source profiles explicitly as input data, they still require measured profiles to justify their derived source factors. The U.S. Supersites Program provided advanced datasets to apply these CMB solutions in different urban areas. Still lacking are better characterization of source emissions, new methods to estimate profile changes between source and receptor, and systematic sensitivity tests of deviations from receptor model assumptions" |
| Keywords: | "Air Pollution/*statistics & numerical data Algorithms *Environmental Restoration and Remediation Models, Theoretical United States United States Environmental Protection Agency;" |
| Notes: | "MedlineWatson, John G Chen, L W Antony Chow, Judith C Doraiswamy, Prakash Lowenthal, Douglas H eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2008/03/06 J Air Waste Manag Assoc. 2008 Feb; 58(2):265-88. doi: 10.3155/1047-3289.58.2.265" |
