Air pollution is not equal to smog!
Speaking of air pollution, the first thing we thought of was smog, the PM2.5 that exploded, but it ignored indoor air pollution.
Indoor air pollution refers to excessive levels of harmful substances in indoor air, causing indoor environmental pollution. Including carbon dioxide emitted by the human body and smoke caused by smoking; harmful gases volatilized by decoration materials and daily necessities; dirty air with microorganisms, viruses, bacteria; cooking fumes in the kitchen; unclean circulating wind of centralized air conditioning systems.
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