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AP® Environmental Science

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Air Pollution: Trapped Smog

APES-1ET8UB

Los Angeles and Mexico City often suffer from episodes of dense smog.

Which atmospheric phenomenon traps the smog in these cities?

A

A large number of cars in these areas add to the level of primary and secondary pollutants which are concentrated close to the ground due to density.

B

Bright sunlight and pollutants create a dense layer of photochemical smog.

C

Temperatures in the thermosphere increase causing the rapid formation of photochemical smog.

D

Adiabatic heating increases the rate at which photochemical smog is formed.

E

A thermal inversion can trap air pollutants close to the ground.