(There seems to be some correspondence with high regional ozone concentrations)

6. What components of particulate matter appear to have relatively high concentrations on

days with good visibility?

(Coarse particulate matter and OC)

7. What are typical values for the humidity adjustment factor during times of year when

most of the days with good visibility occur?

(About “2.3")

8. Does good visibility appear to occur under any specific meteorological conditions?

(Don’t know.)

Answers to the preceding questions suggest that strategies to reduce sulfate

concentrations and, perhaps, regional ozone concentrations might be effective in reducing light

extinction on days when visibility is currently poor. The responses suggest that a strategy which

focuses on this alone should first be tried for the days with good visibility as well. Even though

sulfate concentrations appear low on such days, the fact that sulfates scatter light efficiently (see

Equation (6.1)) and relative humidity is still high enough to enhance this effect is worth

considering. Responses suggest that further meteorological analyses would be worthwhile prior

to selecting strategies to simulate with a resource intensive regional model.

It should be clear from the preceding examples that the initial conceptual description of

an area’s nonattainment problem draws on readily available information and need not be

detailed. It is intended to help launch development and implementation of a modeling/analysis

protocol in a productive direction. It will likely be supplemented by subsequent, more extensive

modeling and ambient analyses performed by or for those implementing the modeling/analysis

protocol discussed in Section 12.0.


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