factors for secondary PM2.5 formation given limitations of other 1 chemical species important in

2 the photochemical reactions, e.g. minimal NH3 in the ambient environment that could limit any

3 precursor pollutant from readily reacting to form secondary PM2.5. The qualitative assessment

4 should include a narrative explaining how any identified significant precursor emissions and

5 subsequent secondary PM2.5 formation could contribute to the existing PM2.5 concentration

6 environment in the region.

7 A good conceptual description will also characterize the meteorological conditions that

8 are representative of the region and are associated with periods and/or seasons of higher and

9 lower ambient 24-hour PM2.5 concentrations. Identification of meteorological phenomena that

10 typically occur during periods of high 24-hour PM2.5 concentrations, such as low-level

11 temperature inversions, stagnant high pressure systems, etc., can be extremely important in

12 understanding the importance, or lack thereof, of photochemistry and secondary PM2.5 formation

13 for the higher ambient PM2.5 concentrations. The analysis and understanding of meteorological

14 conditions will also inform the assessment of the seasonality of the 24-hour PM2.5 concentrations


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