KQ3..Urban Case study 1: Environmental issues in Mexico City

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Where is Mexico City located?
It is located in the valley of Mexico at a high altitude (>2000m), middle of USA.
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What is Mexico City's population?
22million - increasing by 1,000 a day. (huge amounts of in-migration during the 20th Century)
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What are temperature inversions?
Where the air above the ground is warmer than below.
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What is the problem with temperature inversions and air pollution?
Temperature inversions trap pollutants at ground level instead of circulating them away.
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How does temperature inversions trap pollution?
Pollution cannot rise through the warmer lighter inversion layer and is trapped near the ground. High solar radiation turns this pollution into photochemical smog and ozone.
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What are the problems with the air pollution?
It causes 3,000 deaths a year and 2,000,000 suffer chronic lung disease
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What is the air quality like?
Poor-23% less Oxygen because of high altitude so fuels burn less efficiently, creating more pollution.
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How many factories are in the city?
35,000 factories
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How many cars are in the city?
>3.5 million cars
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What is the only input of water at Mexico City?
Precipitation
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What percentage of water supplies are leaked through cracked pipes?
30% of water supplies
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What percentage of industry is located in Mexico City?
60%-uses a huge amount of water and generates much effluent (liquid waste)
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How many tonnes of rubbish is produced a day?
11,000 tonnes (not enough waste collectors, hence rubbish is often dumped in the rivers-increasing health risk)
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What is the problem with farmers using water from rivers to irrigate their crops?
It contaminates food crops
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Card 2

Front

What is Mexico City's population?

Back

22million - increasing by 1,000 a day. (huge amounts of in-migration during the 20th Century)

Card 3

Front

What are temperature inversions?

Back

Preview of the front of card 3

Card 4

Front

What is the problem with temperature inversions and air pollution?

Back

Preview of the front of card 4

Card 5

Front

How does temperature inversions trap pollution?

Back

Preview of the front of card 5
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