What is the most polluted city Shanghai or Mexico City?

Answer 1

Shanghai is quite more polluted than Mexico City right now, due to having air quality levels to 'severe' or 'hazardous' as of lately. Mexico City has had good to medium air quality levels during the last few months.

These values however, tend to vary throughout the year.

Answer 2

Mexico City is considered to be the most polluted, in terms of air pollution. This happens because the city lies at the bottom of a valley, surrounded by mountains. These mountains prevent strong winds from clearing up the smog, like a cook-pot effect. It however, is not as polluted as other cities in the world.

See related links for some photos.

Answer 3

It isn't. The most polluted city in Latin America is Port Au Prince, capital city of Haiti. After an earthquake (2010) that damaged more than 80% of the city, the environmental conditions are appalling: raw sewage running down the streets, corpses still buried under thousands of destroyed buildings, cholera-infected water sources and the ever-present danger of another earthquake make this the worst polluted, environmentally-degraded city in all the Americas.

Answer 4

Mexico City is by far the most polluted city in Mexico. Just imagine the pollution generated by 19 million people.

Answer 5

Mexico City is so polluted by air pollution. It is one of the fastest and largest cities. It has more than 3 million cars and trucks and 100's of Industrial plants.

Answer 6

• Fumes from several industries such as chemical, glass and steel furnaces
• Exhaust fumes from nearly 4 million cars, buses and other vehicles.