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Gr6 SS Activity 2.6 Air Pollution in Mexico City

Epic Design Team

Created on November 6, 2025

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Transcript

Smog in Mexico

What environmental challenges are created by vehicle emissions and industrial activity in densely populated areas? In the 1990's, Mexico City was considered one of the most polluted metropolises in the world. Pollution remains a significant problem, with thousands of deaths a year linked to the effects of environmental contamination. Now the Mexican government is taking action. The "Pro-Aire" program aims to rid the city of smog. Watch the video and click the Geography Traps Pollution button to learn more about this topic.

Geography Traps Pollution

Environmental Challenge

Geography Traps Pollution in Mexico City

Mexico City’s location makes its air pollution problem worse. The city sits high up in the mountains, about 7,350 feet above sea level, and is surrounded by tall mountains on almost all sides. This creates a bowl-like shape that traps dirty air inside. Normally, wind helps push pollution away, but Mexico City does not get a lot of wind, so the pollution from cars, factories, and smoke stays in the air. This leads to smog, a thick, dirty fog made of pollution, which can make it hard to breathe and see clearly. Another reason pollution stays trapped is because of temperature inversion. This happens when a layer of warm air sits on top of cooler air near the ground, like a lid, keeping pollution from escaping. Since the air is thinner at high altitudes, cars and trucks burn fuel less efficiently, creating even more pollution than they would at lower elevations. Because of these natural barriers and weather conditions, Mexico City struggles to clear its air, making pollution a serious problem that needs special rules and efforts to fix.