Question

16.Why are air pollution levels higher in Mexico City than in other similarly densely populated cities?A.because Mexico City is surrounded by mountains that trap polluted air B.because Mexico City receives a large amount of precipitation each year C.because Mexico City contains more cars and buses than other large cities D.because Mexico City engages in more industrial activity than other large cities.

Answer 1

A. because Mexico City is surrounded by mountains that trap polluted air.

The basin topography (plus frequent temperature inversions at high altitude) prevents dispersion of emissions, allowing pollutants from vehicles and industry to accumulate and form smog.