Temperature inversions: are of greatest concern in areas with relatively flat topography typically last for weeks at a time cause gases and particlate matter to remain trapped near the ground all of the choices are correct occur when a layer of warm air is trapped near the ground by colder, upper layer

cause gases and particulate matter to remain trapped near the ground

Explanation:

The temperature inversion is a layer of air that is found in the troposphere. It states that when the air rises with the height it lower down the temperatures and as the air gets thinned.  As the warm air is held above the cod air the normal profile with altitude is inverted. It acts as a layer of separation or boundary of different temperatures. The colder and denser air mass is found near the ground while warm and less dense above it.

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