smog has been a proble m in coal-burning areas for several centuries. smog finally decreased when coal combustion was replaced by petroleum and gas combustion. Air pollution is caused by a fetch of different types of pollutants. The first type, particulate matter, consists of solid and liquid aerosols obviate in the atmosphere. These arise from the burning of coal and from industrial processes. atmospherical particles can s...If you want to get a full essay, modification it on our website: OrderCustomPaper.com
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