Question

a temperature inversion forms when warm air forms a \cap\ on top of the cold air below it. which pollutant often gets \stuck\ below a temperature inversion?
tropospheric (ground level) ozone
hydrogen gas

Explanation:

Temperature inversions trap pollutants. Tropospheric ozone is a pollutant formed near the ground from chemical reactions. Hydrogen gas is not a common trapped pollutant in this context.

Answer:

tropospheric (ground level) ozone