The most appropriate title for the following news item is to prevent the emission of pollutants and to maintain the haze weather in the south.

Human factors

Sources of toxic particulate matter in cities:

First: it is car exhaust. Large vehicles using diesel are "heavy offenders" of PM10 emissions, including large buses, shuttle buses of various units, and large transport trucks. Sources of toxic particulate matter in cities: First, car exhaust. Diesel vehicles are "heavy offenders" of emitting fine particulate matter. Although small cars using gasoline emit gaseous pollutants, such as nitrogen oxides, they can easily be converted into secondary particulate pollutants in foggy weather, aggravating smog.

Motor vehicle exhaust is the main component of smog particles. The latest data shows that motor vehicle exhaust accounts for 22.2% of Beijing’s haze particles, coal burning accounts for 16.7%, and dust accounts for 16.3%. Industry accounts for 15.7%. However, with the advancement of automobile technology and the improvement of oil quality, environmental managers have found that vehicle exhaust does not play a decisive role in the formation of haze weather. However, as some cities with a large number of cars, managers still need to control vehicle emissions. standards to avoid the formation of haze weather.

Second: The waste gas produced by burning coal for heating in winter in the north.

Third: Waste gas emitted from industrial production. For example, metallurgy, kilns and boilers, mechanical and electrical manufacturing, as well as a large number of exhaust gases emitted from the combustion of kilns for auto repair painting and building materials production.

Fourth: Dust generated by construction sites and road traffic.

Fifth: The particle size of growable particles, bacteria and viruses is equivalent to PM0.1-PM2.5. When the humidity and temperature in the air are suitable, microorganisms will adhere to the particles, especially oil smoke. On particulate matter, microorganisms absorb oil droplets and transform into more microorganisms, causing the growth of biological toxic substances in the haze to increase.

Sixth, dust "haze" will also be produced during home decoration. The dust in the room is not only harmful to the health of workers and users, but also increases the burden of cleaning. When the dust is serious, it will also bring many hidden dangers to the decoration project. . [4] [5]

In addition to meteorological conditions, the concentration of particulate matter (including coarse particulate matter PM10 and fine particulate matter PM2.5) in the atmosphere increases due to industrial production, motor vehicle exhaust emissions, and coal burning for heating in winter. , is an important factor in the generation of haze. Today, pollutant emission levels in many cities are at critical points and are very sensitive to meteorological conditions. Air quality can reach standards when diffusion conditions are good. Once adverse weather conditions are encountered, air quality and visibility will immediately decline.

Preventive measures:

1. Open windows less often in hazy weather. You must wear a mask when going out, drink plenty of water, and drink more traditional Chinese medicine teas such as chrysanthemum and berry tea to prevent diseases, eat more fruits, and deeply clean your skin and hair after returning home. In addition, you like to do morning exercises, buy groceries, and walk The elderly should pay attention to going out less, because smog is extremely harmful to the health of the elderly.

2. Wear a mask when going out. Imported from the United States, Provixin Tmall

3. Drink more tea

4. Supplement appropriate amounts of vitamin D

5. Eat a light diet and drink more water

6. Eat more vegetables

7. Try to go out less in hazy weather [6]

8. Be careful when driving Vehicle speed

9. When going out, protect yourself by wearing a PM2.5 mask and an anti-haze nose mask specially designed to prevent haze, filter PM2.5, and breathe fresh air anytime and anywhere.

10. Avoid exercising in foggy weather. You can do morning exercises after the sun comes out. You can also do indoor workouts instead.

11. The patient insists on taking the medicine. Patients with respiratory diseases and cardiovascular and cerebrovascular diseases should insist on taking medicine on time in foggy days

12. Don’t close the windows too tightly. You can choose to open the windows for a short period of time at noon when there is more sunlight and fewer pollutants.

13. Try to stay away from the road. Concentrations of pollutants are highest during rush hours and at night when large vehicles enter the city.

14. Supplement calcium, vitamin D, and eat more tofu, pears, etc.