Meteorology and Air Pollution 365...........
100 1000 1 woo 100000
Downwind distance, rn
Figure 18-16. Standard deviation or dispersion coefficient, cry, in the crosswind
direction as a function of downwind distance (Wark and Warner 1986).
From Table 18-1, we may assume Class D stability. Then, from Fig. 18-16, at
x = 0.5 km, ay is approximately 35 m and 0; is approximately 19 m, and
Q = l.lkg/min = 18g/s.
In this problem, the release is elevated, and H = 60 m.
Applying Eq. (1 8.4), we have
or 11.8 p,g/m3