Which atmospheric condition is related to pollutants often sourced from vehicles?

Photochemical smog is the correct choice because it directly results from chemical reactions involving pollutants that typically originate from vehicle emissions. When vehicles burn fuel, they emit pollutants such as nitrogen oxides and volatile organic compounds. Under the influence of sunlight, these pollutants undergo photochemical reactions, leading to the formation of ozone and other secondary pollutants, which collectively contribute to the phenomenon known as photochemical smog.

In contrast, inversion refers to a temperature profile in the atmosphere where warmer air traps cooler air near the ground, often exacerbating air quality issues by preventing the dispersion of pollutants. While inversions can contribute to higher concentrations of pollutants, they are not a source of those pollutants themselves.

The superadiabatic lapse rate involves a temperature gradient that can lead to instability in the atmosphere but does not have a direct connection to the sources of pollution from vehicles. The adiabatic lapse rate describes the change in temperature that occurs as an air parcel rises or descends. Like the superadiabatic lapse rate, while it might play a role in atmospheric dynamics, it is not directly related to pollutants from vehicles.

Thus, choosing photochemical smog clearly identifies the specific atmospheric condition linked to vehicle-sourced pollutants and their chemical transformation in the presence of sunlight