Toxic gases enter the atmosphere due to
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Major sources of toxic air pollutants outdoors include emissions from coal-fired power plants, industries, and refineries, as well as from cars, trucks and buses. Indoor air also can contain hazardous air pollutants from sources that include tobacco smoke, building materials like asbestos, and chemicals like solvents.
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Hazards from asphyxiants – Simple asphyxiants are gases which can become so concentrated that they displace oxygen in the air (normally about 21 percent). ... Asphyxiants include argon, nitrogen, or carbon monoxide. Chemical exposures due to skin contact or ingestion as well as inhalation of 'bad' air.
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