Environmental Science
Air pollution is likely to be most severe

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

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

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

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