Environmental Science
Air pollution is likely to be most severe

when the atmosphere is turbulent
in the summer
near the center of an anticyclone
in the interior of continents

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Environmental Science
An important reason for the large daily temperature range over deserts is:

The ozone content of desert air is very low
The light-colored sand radiates heat very rapidly at night
There is little water vapor in the air to absorb and re-radiate infrared radiation
Dry air is a very poor heat conductor
Free convection cells are unable to form above the hot desert ground

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