Outdoor activities should be reduced, masks should be worn when going out, and sensitive people should stay indoors. Serious air pollution means that the concentration of pollutants in the air exceeds the national standard. This situation usually occurs under certain meteorological conditions, such as low wind speed, high humidity and inversion temperature. , making it difficult for pollutants to spread and remove.
The main pollutants in the air are particulate matter (PM2.5 and PM 10), sulfur dioxide, nitrogen dioxide, carbon monoxide and ozone. These pollutants mainly come from industrial emissions, traffic exhaust, domestic coal burning and oil fume.
When the air quality is heavily polluted, people should try to avoid long-term outdoor activities, especially the elderly, children, pregnant women and the infirm, and should stay indoors. At the same time, it is necessary to reduce the time of window ventilation and try to use air purifiers and other equipment to purify indoor air.
Causes of poor air quality
1. Industry: Industrial production is an important source of air pollution. There are many kinds of pollutants discharged into the atmosphere by industrial production, including soot, sulfur oxides, nitrogen oxides, organic compounds, halides, carbon compounds and so on. Some are smoke and some are gas.
2. Household stoves and heating boilers: A large number of household stoves and heating boilers in cities need to consume a lot of coal, and coal will release a lot of harmful substances such as dust, sulfur dioxide and carbon monoxide to pollute the atmosphere during combustion. Especially when heating in winter, it often makes the polluted areas filled with smoke, which is also a pollution source that can not be ignored.
3. Transportation: Cars, trains, planes and ships are the main means of transportation at present, and the waste gas produced by burning coal or oil is also an important pollutant. Especially, the cars in cities are large and concentrated, and the pollutants emitted by exhaust gas can directly hit people's respiratory organs, which has caused serious air pollution in cities and has become one of the main sources of air pollution in big cities.
Reference to the above content: Baidu Encyclopedia-lanshan district