1. What is hazardous to human health, especially the nervous system, respiratory system, skin cancer. 2. drain toxins into the atmosphere. Some species persist in the atmosphere for a long time and has spread far. Some species are born, and as a reaction dangerous new substances.3. destroy the buildings and structures, especially the metal causing corrosion. Make the damaged.4. make visibility worse and result in lower-than-normal air temperature has caused the accidents, both in the air, road and water.
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