Answer:
The answer is "occurs when a warm air layer overlies a cooler layer".
Step-by-step explanation:
Its temperature throughout the troposphere falls with altitude in particular. As a consequence, under the cooler air layer, a hot air function is near the ground. Warm air, but on the other hand, is less heavy than cold air. When the warm air near the ground, which includes a lot of pollutants rises just above the cold air layer. The word "thermal inversion" refers to an inversion among cold and warm layers.