23the chemical environment is not conducive to secondary formation). As such, when using either
Public Review Draft 03/04/2013
of these approaches, it may be appropriate to forego the SIL1 assessment and focus on the
2NAAQS compliance demonstration using a cumulative impact analysis.
3For cases where a full quantitative photochemical grid modeling assessment of secondary
4PM2.5 is conducted, the SIL comparison for Case 3 should be based on the combined ambient
5impacts of primary and secondary PM2.5. However, the primary and secondary PM2.5 impacts
6may be combined in various ways which may entail greater or lesser degrees of conservatism.
7For example, combining the peak estimated primary PM2.5 impact with the peak estimated
8secondary PM2.5 impact, unpaired in time and space would likely result in a conservative
9estimate of combined impacts since, as noted above, peak impacts associated with a source’s
10direct PM2.5 and precursor emissions are not likely well-correlated in time or space. On the other
11hand, the conservatism associated with combining peak estimated primary and secondary
12impacts for comparison to the applicable SIL would likely make such an approach easier to
13justify than other approaches for combining estimated primary and secondary PM2.5 impacts.
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castellano: DISPER CUSTIC DESCAR RADIA italiano:
deutsch: DIS CUS DES RAD
castellano: DIS CUS DES RAD english: DIS CUS DES RAD
português: DIS CUS DES RAD italiano: DIS CUS DES RAD
français: DIS CUS DES RAD