From a literal perspective, the radicals of both haze and fog are "rain", and both are related to the weather. Low visibility and being damp and moist were the common definitions of fog by early people. Fog often appeared in bamboo forests, on the coast, on the mountain slopes, and even on the streets and alleys of cities, giving a natural hazy feeling and disappearing after sunrise or when the wind blew.

These initial impressions persisted until last year. In 2014, haze became known to everyone. At that time, we might not have known what haze was, how harmful it was, or even that it could cause fatal harm to people. What we knew was that haze covered most of the area for a long time, and people outdoors moved around with visibility less than 5 meters. The wind could no longer disperse these pollutants with low visibility. At that time, masks became a necessary travel item.

In March 2015, the documentary "Under the Dome" produced by Chai Jing detailedly explained the causes and hazards of haze. It turned out that haze was mainly caused by the burning of coal, the refining of oil, and the emissions from cars. It contained a large amount of pollutants, especially PM2.5, industrial waste gas, and vehicle exhaust. Inhalation of these pollutants would cause serious harm to the respiratory tract and lungs. The hazards of haze were thus evident.

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