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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