1

^^ Meteorological Data Station

FIG. 5.7.1 Pollution roses, with SO2 concentrations greater than 250 ^g/m. The major suspected sources are the four chemical plants, but the data indicates that Plant Three is the primary culprit. (Reprinted, with permission, from P.A. Vesilind, 1983, Environmental pollution and control, Ann Arbor Science Publishers.)

■ Based on Other Environmental Factors Being Equal

FIG. 5.7.2 Plant site selection within a localized region influenced by meteorological conditions.

■ Based on Other Environmental Factors Being Equal

FIG. 5.7.2 Plant site selection within a localized region influenced by meteorological conditions.

A plant must control emission rates to ensure that problems do not occur even during poor dispersion conditions. This control requires full knowledge of the frequency of poor dispersion weather. In addition, weather conditions should be considered when plant start ups are scheduled or major repairs that may produce more emissions are undertaken.

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