Fast - Brainiest - multiple choice - 45PTS
Both Mexico City and New York City or highly populated areas why is the air pollution in Mexico much worse?

A. Mexico City receives a large amount of yearly precipitation.
B. Mexico City is surrounded by mountains that trap the polluted air.
C. Mexico City operates a larger public transit system than New York City
D. Mexico City has more factories that use cleaner fuels than New York City.