In the past few days, Hubei has been accompanied by sunny days.
The temperature is warming up quickly.
But beware!There is a "haze in front of you"!
Where does the "haze come from?".
And how should the public respond?
Let's find out.
How is "haze" formed?
Haze, also known as haze and haze, refers to the turbidity phenomenon formed by the suspension of a large amount of smoke, dust and other particles for unknown reasons.
The core substance of haze is the dust particles suspended in the air, which are meteorologically called aerosol particles.
As a natural phenomenon, haze is formed due to three factors:
The first is the increase in the phenomenon of static wind in the horizontal direction. With the rapid development of urban construction, the buildings are built higher and higher, which increases the ground friction coefficient and weakens the wind flow through the urban area. The increase of static wind phenomenon is not conducive to the expansion and dilution of air pollutants to the periphery of urban areas, and it is easy to accumulate high concentration of pollution in urban areas.
The second is the phenomenon of vertical temperature inversion. The inversion layer is like a pot lid covering the sky above the city, so that the temperature inversion above the city is higher than that of the low air. Under normal climatic conditions, pollutants diffuse from low air with high air temperature to high air with low air temperature, and are gradually discharged into the atmosphere in a circular manner. However, under the inversion phenomenon, the temperature at low altitude is lower, resulting in the retention of pollutants and the inability to discharge them in time.
The third is the increase in suspended particulate matter. In recent years, with the development of industry, the increase of motor vehicles, pollutant emissions and urban suspended solids have increased significantly, which directly leads to the reduction of visibility and makes the whole city look gray. The formation of haze is closely related to the emission of pollutants, and the exhaust of motor vehicles and other smoke and dust emission sources in the city emit fine particles with a particle size of microns, which stay in the atmosphere, and form haze when the weather such as temperature inversion and calm wind is not conducive to diffusion.
haze".
Slight haze: 80% relative humidity of the air;
5 km Visibility 10 km.
Mild haze: 80% relative humidity of the air;
3 km Visibility 5 km.
Moderate haze: 80% relative humidity of the air;
2 km Visibility 3 km.
Severe haze: The relative humidity of the air is less than or equal to 80%;
Visibility 2 km.
How the public responds to the "haze" on all sides.
Avoid long-term, high-intensity outdoor activities on hazy days.
People with cardiovascular, cerebrovascular, and respiratory diseases.
Go out less.
If you need to go out, you should wear a mask.
When you return indoors, wash your hands and face frequently.
Pay attention to your own hygiene.
Anti-Smog Guidelines Reduce going out Wear a qualified mask properly when going out.
In foggy and hazy weather, you should reduce the time you go out, and if you have to go out, you should reduce the time you spend outdoors, and it is recommended to wear a protective mask (such as an N95 mask or PM2.).5. Protective masks), pay attention to the mask should fit the face when wearing, and it is best not to wear it for more than 2 hours.
Wash your face, rinse your mouth, and clean your nose in time after returning home.
In foggy and hazy weather, the fine particulate pollutants in the atmosphere PM25. More toxic substances will be adhered to it. Even though we wore masks or headscarves, the dust was so thick in the air that we couldn't completely isolate it. Therefore, after returning home from going out, it is necessary to wash the face, mouth and nose and exposed ** in time to reduce the chance of toxic substances entering the body as much as possible.
Do not open windows indoors for ventilation.
When foggy and haze weather occurs, outdoor air will enter the room through doors and windows, causing the concentration of indoor air pollutants to rise, so try to keep doors and windows closed, and do not dry clothes in the open air. If possible, air purification equipment can be used, and parts can be replaced or cleaned regularly according to the instructions.
Eat a light diet, drink plenty of water, and eat more vegetables and fruits.
The diet should be light, drink more water, eat more fresh vegetables and fruits, which can not only supplement various vitamins and inorganic salts, but also play a role in moistening the lungs and removing dryness, expelling phlegm and relieving cough, strengthening the spleen and kidneys.
Focus on the "easy to recruit" crowd.
The elderly, children, the disabled, pregnant women and other people are more sensitive and more susceptible to smog and hazeIn addition, patients who are already suffering from respiratory diseases will also be aggravated by fog and hazeAt the same time, smog and haze will also cause an increase in the number of patients with cardiovascular and cerebrovascular diseases and depression. Therefore, in foggy and hazy weather, we need to pay more attention to the above-mentioned groups.
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