The definition and cause of air pollution
Air pollution, also known as air pollution, according to the definition of the International Organization for Standardization (ISO), air pollution usually refers to: due to human activities or natural processes, certain substances enter the atmosphere, present sufficient concentration, enough time, And thus endangering human comfort, health and welfare or the environment.
In other words, as long as the quantity, nature and time of a certain substance are sufficient to affect humans or other creatures or property, we can call it air pollutants; and the phenomenon caused by its existence is air pollution.
On October 27, 2017, the World Health Organization’s International Agency for Research on Cancer published a preliminary list of carcinogens, and outdoor air pollution is on the list of carcinogens.
The atmosphere is a mixture of a certain proportion of nitrogen, oxygen, carbon dioxide, water vapor and solid impurity particles. In terms of air pollution, by standard, nitrogen accounts for 78.08%, oxygen accounts for 20.94%, rare gas accounts for 0.93%, carbon dioxide accounts for 0.03%, and other gases and impurities are about 0.02% by volume. Various natural changes often cause changes in atmospheric composition. For example, when a volcanic eruption, a large amount of dust and carbon dioxide gas is injected into the atmosphere, causing volcanic eruption in the volcanic eruption area and poisonous gas; large-area forest fires caused by natural causes such as thunder and lightning also increase the content of carbon dioxide and soot.
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