Using the examples of Mexico City and Los Angeles, discuss the special problems that vehicles create ...

Mexico City and Los Angeles have one important thing in common, photochemical smog. Photochemical smog is a mixture of primary (nitrogen oxides and VOCs) and secondary pollutants (trophospheric ozone and more than 100 different toxic derivatives from their interaction in the presence of solar UV light). Both cities have geographic conditions that promote the formation of thermal inversions which can trap the smog near the ground for long periods of time and produce dangerously high concentrations of pollutants. The result is an assault of human respiratory systems that has caused thousands to die premature deaths. Los Angeles and Mexico City have both greatly improved the levels of smog by developing mass transit and by requiring strict pollution control technologies on vehicles.

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