Why is there foggy weather?

1. Haze is a combination of fog and haze. Because of the deterioration of air quality, the phenomenon of cloudy weather has increased and the harm has increased. In many areas of China, haze weather phenomenon is combined with fog as a warning and forecast of disastrous weather. Collectively referred to as "haze weather".

second, the formation conditions of smog: the large-scale smog weather mainly appears in the large-scale atmospheric circulation situation with weak cold air and good water vapor conditions. The low altitude near the ground is still wind or breeze, and the pollutants discharged from traffic, life and production in some areas are constantly accumulating at low altitude, which can not be dispersed and quickly forms pollution.

third, the haze weather is a kind of disastrous weather. Actually, there is a difference between "fog" and "haze".

fog is a large number of tiny water droplets or ice crystals floating in the air, and the formation conditions should have a high water vapor saturation factor. When fog appears, the relative humidity of the air often reaches 1% or close to 1%. Fog is more common or thicker in the morning and evening with the daily change of air humidity, and it is relatively lightened or even disappeared during the day.

The meteorological definition of haze is a weather phenomenon in which a large number of tiny dust particles, smoke particles or salt particles are suspended in the atmosphere, which makes the air turbid and reduces the horizontal visibility to below 1km. Haze is generally milky white. There are three causes:

1. The phenomenon of still wind increases in the horizontal direction. The buildings in the city are built higher and higher, ZRA smog purifier, and German Seiko focuses on smog prevention! Blocking and friction make the airflow weaken obviously when passing through the urban area. The increase of static wind phenomenon is not conducive to the diffusion and dilution of suspended particles in the atmosphere, and it is easy to accumulate around urban areas and suburbs;

2. there is an inversion in the vertical direction. The inversion layer is like a pot cover over a city. This inversion phenomenon, in which the air temperature at high altitude is higher than that at low altitude, restricts the vertical movement of the air at low altitude, making it difficult for suspended particles in the air to drift to high altitude and be blocked at low altitude and near the ground.

3. The increase of suspended particles in the air. With the growth of urban population and industrial development, the number of motor vehicles has soared, and the emission of pollutants and suspended solids have increased greatly, which directly leads to the decrease of visibility.

4. Haze weather is harmful to people

1. Haze weather has a serious impact on cardiovascular and cerebrovascular diseases, which will hinder normal blood circulation, lead to cardiovascular disease, hypertension, coronary heart disease and cerebral hemorrhage, and may induce angina pectoris, myocardial infarction, heart failure, etc., resulting in pulmonary heart disease in chronic bronchitis.

2. When the pressure is relatively low in dense fog, people will feel irritable and their blood pressure will naturally increase. On the other hand, in foggy days, the temperature is often low. Some patients with hypertension and coronary heart disease suddenly go from warm indoor to cold outdoor, and blood vessels expand with heat and contract with cold, which can also increase blood pressure, leading to stroke and myocardial infarction.

3. Continuous foggy days have an impact on people's psychology and body. Psychologically speaking, foggy days will cause people a dull and depressed feeling, which will stimulate or aggravate the state of psychological depression. In addition, due to the weak light and the low air pressure in foggy days, some people will feel lazy and depressed in foggy days.

4. Particle itself contains many kinds of harmful substances and is the carrier of pollutants, so it is harmful to human body in many ways. First of all, particulate matter can stimulate and corrode alveolar wall, and long-term action can destroy the defense function of respiratory tract, resulting in chronic bronchitis, emphysema, bronchial asthma and other diseases. Secondly, particulate matter can cause the decline of human immune function. It is found that the immune function of primary school students exposed to particulate pollution for a long time will be significantly inhibited. On the other hand, particulate matter can also increase the sensitivity of animals to bacteria, which leads to the decline of lung resistance to infection.

V. How to prevent haze

For people who are sensitive to pollution, such as the elderly, children, pregnant women, heart patients and respiratory diseases, it is best to reduce outdoor activities on cloudy days. Wear a mask above N95 when going out. It is best to eat more fruits and pig liver, pig blood, mung bean soup, red bean soup, lotus seed boiled water, etc. to prevent the smog weather from affecting your respiratory tract.

above, I hope it can help you.