^^ 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.)
sider the frequency of stagnant weather periods and the effects of topography and local wind systems, such as land-sea breezes and mountain-valley winds, with respect to dispersion patterns and nearby residential and industrial areas.
The location of the plant within an area can depend on local wind speed and directions data. For example, residential areas may lie downwind of a proposed plant, in line with the prevailing wind direction. Considering a more suitable site would reduce the air pollution impact of the plant. Figure 5.7.2 illustrates this point.
Data on temperature, humidity, wind speed and direction, and precipitation are generally available through official weather agencies. Other potential sources of information are local airports, military installations, public utilities, and colleges and universities. The National Climatological Data Center, Asheville, North Carolina, is a major source of information. The center also contracts to prepare specific weather summaries and frequency.
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