In our country, industrial wastes are polluting the air, soil and water resources on many large areas, directly affect the lives and health of people. The air environment special has not been much attention. In particular, the chemical industry, mining industry and thermal power sector, coal processing, steel industry ... This is the waste that are very toxic, dangerous to the human and natural environment not only in the present but also affect the long-term. In Viet nam, it is more hazardous when companies don't yet have factory gas processing system before release school
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