13. Do periods with high measured particulate matter or components of particulate matter

appear to track each other or any other measured pollutant?

(There appears to be some correspondence between measured high concentrations of

SO4 and ozone).

Using responses to the preceding questions in this example, it is possible to construct an

initial conceptual description of the nonattainment area’s PM2.5 problem. First, responses to

questions 1, 2 and 3 suggest there is a significant regional component to the area’s nonattainment

problem. Second, responses to questions 1 and 3 indicate there is a local component to the

problem.. The responses to questions 11,12 and 13 suggest that there may be a link between

reducing ozone and reducing particulate matter. Thus, it may be appropriate to assess effects of

previously committed to strategies to reduce ozone and national PM control measures before

simulating additional control measures. The responses to questions 4 and 5 suggest that it is

premature to determine whether a “local area analysis” will be needed. The response to question

7 suggests that it may not be necessary to model with very small grid cells, at least for the

secondary components of PM2.5.

The preceding conceptual description implies that the State containing the nonattainment

area in this example will need to involve stakeholders from other, nearby States to develop and

implement a modeling/analysis protocol. It also suggests that a nested regional modeling

analysis will be needed to address the problem.


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