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

Which atmospheric phenomenon traps the smog in these cities?


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.


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


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


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


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

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