What is the main source of smog?

The main sources of smog are divided into human factors and climate factors, as follows:

1, human factors

The concentration of particulate matter (including coarse particulate matter PM 10 and fine particulate matter PM2.5) in the atmosphere caused by industrial production, vehicle exhaust emission and coal burning in winter is an important factor of smog.

The source of urban toxic particulate matter is automobile exhaust, which is easy to be converted into secondary particulate matter pollutants, aggravating smog; Waste gas produced by coal-fired heating in winter in northern China; Waste gas produced by industrial production; Dust generated by construction sites and road traffic; The size of growable particles, bacteria and viruses is equivalent to PM 0.1~ PM 2.5; Home decoration will also produce dust "smog".

2. Climate factors

It is mainly the result of the interaction between a large number of particles suspended in the air and meteorological conditions. There are three reasons: the phenomenon of increasing static wind in the horizontal direction; There is inversion in the vertical direction; The increase of suspended particles and organic pollutants in the air. With the growth of urban population and industrial development, the number of motor vehicles has surged, resulting in a large increase in pollutant emissions and suspended solids.

Extended data:

Haze protection

1, professional voice protection

Professional voice users, such as teachers, lecturers, singers, presenters, salespeople, etc. You often need to use your throat, and throat problems are more likely to appear in foggy days. It is suggested that the use of sound should be reduced as much as possible in foggy days, so that the sound can get enough rest. When going out, you should wear a mask, keep the indoor temperature and humidity, drink plenty of water, and drink some traditional Chinese medicine instead of tea to prevent and treat throat discomfort, which usually has the effect of protecting vocal cords.

2, the choice of protective equipment

N95 mask is one of nine kinds of anti-particle masks certified by NIOSH (National Institute of Occupational Safety and Health). "n" means not suitable for oily particles. Under the detection conditions specified by NIOSH standard, the filtration efficiency reaches 95%.

As personal protective equipment, gas masks are used to provide effective protection for people's respiratory organs, eyes and facial skin, and to prevent toxic substances such as toxic gases, dust and bacteria. Gas masks are widely used in petroleum, chemical industry, mining, metallurgy, military, fire fighting, emergency rescue and disaster relief, health and epidemic prevention, science and technology, environmental protection and other fields.

The air purifier can adsorb, decompose or transform various air pollutants (generally including dust, pollen, odor, decoration pollution such as formaldehyde, bacteria, allergens, etc.). ), and effectively improve the air cleanliness. Household and commercial air purifiers are mainly used to remove indoor air pollution.

The PM2.5 air quality detector can continuously monitor the dust concentration, and at the same time collect the particulate matter, so as to analyze its composition and calculate the conversion coefficient K of mass concentration. It can directly read the dust mass concentration (mg/m) and monitor the inhalable dust PM2.5

Baidu encyclopedia-smog