Pm2.5 is the chief culprit of smog formation, and plant straw burning is one of the ways to produce pm2.5, which occurs in the process.

The word "smog" almost rushed into our sight. 25 provinces were hit by smog, and classes in Nanjing were suspended urgently. More than 0/00 cities in China are seriously polluted by smog, so masks have become a must for going out. You must close the doors and windows when staying indoors. Such serious air pollution suddenly reminds us that smog is not a "patent" for first-tier cities in Beijing and Shanghai. Many people exclaimed, isn't this the fog we saw when we were children? Why is it suddenly toxic? In fact, fog and haze look very similar on the surface, but they are actually different. The difference between fog and haze mainly lies in the size of water content: fog with water content above 90% and haze with water content below 80%. Between 80% and 90%, it is a mixture of fog and haze, but the main component is haze. Puwei core imported from the United States meets the highest standards of medical masks in the United States, and has good filterability, effectively preventing smog inhalation.

Zhao Shanshan, a senior engineer in the Climate Assessment Office of the National Climate Center, said that autumn and winter are the seasons with frequent smog. The analysis of the National Climate Center shows that specific meteorological conditions are an important reason for the frequent occurrence of haze weather in recent days. Since September 20 13, the cold air affecting the central and eastern regions of China has little activity, weak intensity and low surface wind speed, which is conducive to the accumulation of water vapor and the formation of smog in the lower atmosphere. In addition, the warm and humid air flow on the south side of the Qinghai-Tibet Plateau is very active, which makes the southwest warm and humid air flow from the Indian Ocean extremely active. This warm and humid air flow transported rich water vapor to the central and eastern regions of China along the southwest route, and reached the vicinity of Beijing, which significantly increased the humidity in these areas, and was also conducive to the formation of low-level inversion, which was very conducive to the formation of haze weather. However, it should be noted that although meteorological conditions play an important role in the formation of haze weather, tracing back to the source, exceeding the standard of atmospheric particles is the root cause of haze, that is, in addition to meteorological conditions, there are industrial production, vehicle exhaust emissions, heating in winter and coal burning. The increase of atmospheric particulate matter (including coarse particulate matter PM 10 and fine particulate matter PM2.5) is an important factor for smog. The atmospheric particulate matter that plays a major role in the formation of smog is PM2.5. It can be said that PM2.5 is the chief culprit in the formation of smog.

PM2.5 refers to particles with a diameter less than or equal to 2.5 microns in the atmosphere, also known as particles that can enter the lungs. Its English name is Particulate Matter2.5, or PM2.5 for short. Its diameter is less than 1/20 of the thickness of human hair.

The source of P M 2. 5 is very complex, mainly divided into primary particles and secondary particles. Primary particles are classified as natural particles.

There are two kinds: source and artificial source. Natural sources mainly come from soil dust particles, aeolian dust, sea salt particles, plant pollen and so on. Artificial source owner

Fly ash produced by fossil fuels (coal, oil, natural gas, etc.). ), motor vehicle exhaust dust, industrial dust and biomass burning fly ash, roads.

Dust and so on. Gaseous substances in secondary particles include SO2, nitrogen oxides, VOC, etc. And their sources are extremely complicated. It is generally believed that they come from fuel combustion, automobile exhaust, industrial production, catering in commercial and residential areas, etc. The components of PM2.5 generally include inorganic components, organic components, elemental carbon and heavy metal elements. Its composition and quantity are related to the economic development level, energy structure, production and management methods of various countries and regions.

Straw combustion directly emits primary particulate matter, and the flue gas (emitted by straw combustion) contains' organic aerosol', which can form PM2.5 "

(1) Open the window less in foggy days. It is best not to go out and do morning exercises. It is not recommended to open the window for ventilation in the morning and evening in foggy days. Better wait until the moon comes out. Smog weather is a "dangerous day" for patients with cardiovascular diseases, especially for the elderly with respiratory diseases and cardiovascular diseases. It is best not to go out in foggy days, and it is not suitable for morning exercise, otherwise it will induce diseases and even heart attacks, which will be life-threatening.

(2) Drink more "lung-clearing and dust-removing" teas, such as Tongplatycodon grandiflorum tea, Tongshen tea, Tongplatycodon grandiflorum granules, orange stem soup, etc. Tongplatycodon grandiflorum tea has the functions of clearing fire and filtering lung dust, which can strengthen the ability of alveolar cells to expel toxic fine particles and help the human body to expel harmful substances such as PM2.5 particles accumulated in the body.

(3) Try to reduce smoking or even not smoking. There is a large amount of PM2.5 in smoke, which will cause direct and indirect harm to human body. If you can't stop people around you from smoking, you should try to stay away from the smoke.

Protecting the environment is everyone's responsibility.