8 Since modeling of direct PM2.5 emissions has not been a routine requirement to date, the

9 availability of an adequate direct PM2.5 emission inventory for nearby sources may not exist in

10 all cases. Recommendations for developing PM2.5 emission inventories for use in PSD

11 applications will be addressed separately, but existing SIP inventories for PM2.5 or statewide

12 PSD inventories of sources for refined modeling may provide a useful starting point for this

13 effort.

14

15 IV.2 Monitored Background

16 Sections 8.2.2 and 8.2.3 of Appendix W provide recommendations for determination of

17 background concentrations for inclusion in cumulative impact assessments for NAAQS and

18 increment compliance, which should account for impacts from existing sources that are not

19 explicitly included in the modeled inventory and natural sources. From pre-construction

20 monitoring data and/or existing representative air quality data, applicants should assess and

 

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