ECOLOGY
ENVIRONMENTAL ISSUES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It is one of the world’s largest cities.
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The city has views of distant snowcapped mountains.
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It lies in a bowl-shaped valley that traps air pollutants.
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The cars and factories send pollution such as lead, sulfur, and carbon monoxide into the air.
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Detailed explanation-1: -Located in the crater of an extinct volcano, Mexico City is about 2, 240 metres above sea level. The lower atmospheric oxygen levels at this altitude cause incomplete fuel combustion in engines and higher emissions of carbon monoxide and other compounds. Intense sunlight turns these into higher than normal smog levels.
Detailed explanation-2: -In additions to trapping pollutants in its bowl-like landscape, Mexico City is also at a high altitude, nearly 7, 400 feet above sea level, which increases levels of solar radiation. In turn, that stimulates the formation of ozone.
Detailed explanation-3: -How does geography play a role in Mexico City’s air pollution problem? It’s surrounded by mountains which trap the air. It’s near the Atacama desert, which causes sandstorms.
Detailed explanation-4: -Population growth, increasing motorization and industrial activities, a constrained basin and intense solar radiation combined to cause intense air-quality problems of both primary and secondary pollutants.