HISTORY
THE WORLD TODAY
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Greater Mexico City
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Central Mexico
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Northern Mexico
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Southern Mexico
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Detailed explanation-1: -Mexico City was once named as the world’s most polluted city in the world, but according to IQAir, a Swiss company which keeps track of the air quality of cities around the globe, Mexico City has now dropped down to the 917th most polluted city in the world in 2021.
Detailed explanation-2: -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.
Detailed explanation-3: -Such a rapid and unexpected growth led to the UN declaring Mexico City as the most polluted city in the world in 1992. This was partly due to Mexico City’s high altitude (7382 ft above sea level), which causes its oxygen levels to be 25% lower. Carbon-based fuels also do not combust completely.