13. Does thermal inversion
occur in the winter or in the
summer?

Gap-fill exercise

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Pollutant low altitude thermal
occurs in the winter. this period of
the the sun heats the less and
the natural move of warm air
. Therefore the pollutants
form low altitude layer between
cold air layer near ground and
another layer warmer air above. The
layer over industrial areas
big urban concentrations reduces
penetration of the sun's and the
air bellow an even longer time
warm.