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there are more than 150 metropolis in the world with a population of 1 to 15 million. tokyo, new york, london and moscow, only some of the mega cities. people in the mega cities are suffering from environmental pollution, bad water, bad air and noise. a new term, urban climate, used now for such cities. this means high temperature atmosphere, deliberately and intensive managed. the world health organization studying air pollution around the world for eight years. it is measured by two things: the level of sulphur dioxide in the air and the smoke. sulfur dioxide and smoke pollute water and serious impact on forests and human health. the who report shows that the most polluted, milan, moscow, prague, santiago and sao paulo.
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