11 IV.3 Comparison to NAAQS

12 Combining the modeled and monitored concentrations of PM2.5 for comparison to the

13 PM2.5 NAAQS also entails considerations that differ from those for other criteria pollutants due

14 to the issues identified above. The discussion below addresses comparisons to the NAAQS in

15 the context of dispersion modeling of direct PM2.5 emissions only (for Case 2), and also provides

16 guidance regarding NAAQS comparisons for applications involving qualitative, hybrid

17 qualitative/quantitative, or full quantitative photochemical grid modeling assessments of

18 secondary PM2.5 impacts (for Cases 3 and 4).

19 Given the importance of secondary contributions for PM2.5 and the potentially high

20 background levels relative to the NAAQS for PM2.5, greater emphasis is generally placed on the

21 monitored background contribution relative to the modeled inventory for PM2.5 than for other

22 pollutants. Also, given the probabilistic form of the PM2.5 NAAQS, careful consideration must

23 be given to how the monitored and modeled concentrations are combined to estimate the

 

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