Page 334 - Fundamentals of Air Pollution 3E

290 18. The Meteorological Bases of Atmospheric Pollution

3. What atmospheric characteristics are usually associated with stagnating high-pressure
systems?
4. What factors contribute to a high mixing height?
5. Discuss the simularities of the three major episodes of pollution (Meuse Valley, Donora,
and London).
6. A railroad tank car has derailed and overturned, and some material is leaking out and
apparently evaporating. The car is labeled "Toxic." In order to take appropriate emergency
action, which meteorological factors would you consider and how would you assess them?
7. In addition to air pollutants, what meteorological factor has a profound effect on decreasing
visibility, and what is the approximate threshold of its influence?
8. What pollution factors may affect precipitation?
9. What is the approximate lowering of the centroid of a dispersing cloud of particles at
2 krn from the source whose mass medium diameter is 30 fj.m and whose particle density
3
1
is 1 g cm in a 5 m s" wind?
1
10. Prior to the onset of rain at the rate of 2.5 mm h" , the average concentration of 10-/u,m
3
particles in a pollutant plume is 80 ^tg m" . What is the average concentration after
30 min of rain at this rate?