Would you expect a fumigation-type smoke plume on a warm, sunny afternoon Explai

Question

Would you expect a fumigation-type smoke plume on a warm, sunny afternoon Explain. Five a few reasons why, in industrial areas, night-time pollution levels might be higher than daytime levels. Explain this apparent paradox: High levels of tropospheric (ground-level) ozone are "bad" and we try to reduce them, whereas high levels of stratospheric ozone are "good" and we try to maintain them. A large industrial smokestacks located within an urban area emits vast quantities of sulfur dioxide and nitrogen dioxide. Following criticism form local residents that emissions form the stack are contributing to poor air quality in the area, the managements raises the height of the stack form 10 m (33 ft) to 100 m (330ft). Will this increase in stack height

Explanation / Answer

1.Yes, fumigation type smoke plume is expected during hot sunny afternoon. During very sunny day with some wind blowing, radiation from the ground upward is very good. Strong convection currents moving upward are produced. Under these conditions plumes tend to loop upward and then down to the ground known as looping plumes.

2. At night the temperature is lower as compared to day time, the nights are cool and the pollution from industry, and other sources like smoke, vehicle etc. becomes trapped above the area, often following a clear cloudless night. Cold air (containing dense layer of pollutants) then becomes trapped by a layer of warmer air above the area. Hence the area has dense pollution.

3.When enough ozone molecules are present, it forms a pale blue gas. It is an unstable molecule that readily combines with other atoms. Ozone has the same chemical structure whether it is found in the stratosphere as well as troposphere layer of the atmosphere.

In the troposphere, the ground-level or "bad" ozone is an air pollutant that damages human health, vegetation, and many common materials. It is a key ingredient of urban smog. In the stratosphere, we find the "good" ozone that protects life on earth from the harmful effects of the sun's ultraviolet rays. The stratosphere layer blocks the sun's ultraviolet (UV) waves and prevents them from reaching the earth's surface

4.With increase in the height of the smokestack, the dispersion of pollutants at higher altitudes can reduce their impact on the immediate surroundings. In the case of chemically aggressive output, a sufficiently tall smokestack, can allow for partial or complete self-neutralization of airborne chemicals before they reach ground level. The dispersion of pollutants over a greater area can reduce their concentrations and facilitate compliance with regulatory limits.

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