W with new analytical techniques or models for ozone and secondary 1 PM2.5 per the EPA’s

2 commitments with the Sierra Club petition grant.15


4 III.2.3.2 Source Apportionment and Source Sensitivity in Photochemical Grid Models

5 Some photochemical grid models have been instrumented with source apportionment

6 techniques, which track emissions from specific sources through the chemical transformation,

7 transport, and deposition processes to estimate the source’s contribution to predicted air quality

8 at downwind receptors (Baker and Foley, 2011). Source sensitivity approaches provide

9 information about how model predicted concentrations change based on an increase or decrease

10 in emissions from a specific source. The difference in air quality between the original baseline

11 simulation and the simulation where emissions are perturbed provides a quantitative estimate of

12 that source’s contribution to the cumulative impact estimate.

13 Another approach to differentiate the contribution of single sources on changes in model

14 predicted air quality is the direct decoupled method (DDM), which tracks the sensitivity of

15 model results to emissions for a specific source through all chemical and physical processes in


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