Why is there foggy weather?

1. Haze is a combination of fog and haze. Because of the deterioration of air quality, cloudy days have increased and the harm has increased. In many areas of our country, the smog weather phenomenon is combined with fog as an early 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 pollutants discharged from traffic, life and production in some areas accumulate at low altitude, which cannot be dispersed and quickly form pollution.

Third, smog 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 coefficient. When fog appears, the relative humidity of air often reaches 100% or approaches 100%. With the daily change of air humidity, fog is more common or thicker in the morning and evening, and it becomes lighter or even disappears during the day.

The meteorological definition of smog is a weather phenomenon that 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 10km. Haze is generally milky white. There are three reasons:

1. The static wind phenomenon increases in the horizontal direction. The city's buildings are built higher and higher, ZRA smog purifier, Germany Seiko focuses on smog prevention! Blockage 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 that the upper air temperature is higher than the lower air temperature limits the vertical movement of the lower air, making it difficult for suspended particles in the air to drift to the upper air and be blocked at the lower air 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 emissions of pollutants and suspended solids have increased greatly, which directly leads to the decline of visibility.

Fourth, the harm of smog weather to people.

1. Smoggy days also have a serious impact on human cardiovascular and cerebrovascular diseases, which will hinder normal blood circulation, lead to cardiovascular diseases, hypertension, coronary heart disease and cerebral hemorrhage, and may induce angina pectoris, myocardial infarction and heart failure. And make chronic bronchitis get pulmonary heart disease.

2. When the air pressure is relatively low in dense fog, people will feel irritable and their blood pressure will naturally rise. 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 will also increase blood pressure, leading to stroke and myocardial infarction.

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

4. Particulate matter itself contains a variety of harmful substances, which 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 will 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 obviously inhibited. On the other hand, particulate matter can also increase the sensitivity of animals to bacteria, leading to the decline of lung anti-infection ability.

Verb (abbreviation of verb) how to prevent smog

The elderly, children, pregnant women, patients with heart disease, patients with respiratory diseases and other people sensitive to pollution, 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, pig liver, pig blood, mung bean soup, red bean soup, lotus seed boiled water and so on. Prevent smog weather from affecting your respiratory tract.

Above, I hope to help you.