the impact from secondary PM2.5 formation.13 With appropriate 1 submittal, consultation, and

2 subsequent approval of the modeling protocol by the appropriate permit reviewing authority,

3 many potential problems and unintended oversights in the qualitative assessment can be resolved

4 early in the process or avoided all together.

5 In the development of an appropriate conceptual description of PM2.5 to support a

6 qualitative assessment of the impact from secondary PM2.5 formation, it is important to fully

7 characterize the current PM2.5 concentrations in the region where the new or modifying

8 emissions source is to be located. This characterization should take into consideration not only

9 the most current 24-hour and annual PM2.5 design values, which would typically be used as

10 background concentrations in a cumulative modeling demonstration, but should also include an

11 understanding of the seasonality and speciated composition of the current PM2.5 concentrations

12 and any long term trends that may be occurring. Understanding whether or not PM2.5

13 concentrations are higher or lower in certain seasons or fairly uniform throughout a year and


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