16 Nearby sources

17 o Primary impacts on PM2.5 from direct PM2.5 emissions, as appropriate

18 Monitored background of PM2.5 that accounts for secondary PM2.5 impacts from

19 regional transport and precursor emissions from nearby sources, and primary

20 PM2.5 impacts from other background sources not included in the modeled

21 inventory.

22

23 As with the significant impact analysis discussed previously, the primary impacts related

1 source and nearby sources should

2 be estimated based on the AERMOD dispersion model (or other acceptable preferred model or

3 an approved alternative model) while the estimate of secondary PM2.5 impacts from the proposed

4 new or modifying source will vary depending on whether the assessment of the proposed

5 source’s precursor emission impacts on secondary PM2.5 formation are: a) qualitative in nature;

6 b) based on a hybrid of qualitative and quantitative assessments utilizing existing technical work;

7 or c) based on a full quantitative photochemical grid modeling exercise. As noted above,

8 secondary impacts on PM2.5 from regional transport and precursor emissions from nearby

9 sources should be accounted for through representative monitored background concentrations of

10 PM2.5.

 

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