The rain is not clean. Because the rain will encounter suspended particles such as dust and smoke when it is formed, and part of the dust and pollutants in the atmosphere will be wrapped in the process of rain falling, the rain is not clean. Is the rainwater clean? The main component of rainwater is water, and it also contains a small amount of sulfur dioxide, nitrogen dioxide, impurities and floating dust.
In cities with poor air and dense flow of people, rainwater not only contains impurities and pollutants, but also has a certain degree of pollution.
In areas with serious air pollution, it is necessary to wash immediately after being wet in a large area by rain, so as to avoid skin discomfort caused by harmful substances in rain water on clothes. （YuShuiGanJingMa）