Question 1: Why is there haze in summer? Doesn’t it mean that haze only occurs in winter? Now that the weather is hot, why is the air pollution index still so bad? Smog has a certain relationship with the seasons, but it is not the season that causes the haze. The reason why the haze is more serious in winter is because the vegetation withers in winter, so we cannot control the haze. Effective control, while in summer the branches and leaves are luxuriant, able to absorb haze. Therefore, only by understanding the root causes of smog can we solve air pollution. The main causes of smog are high-energy pollutants, vehicle exhaust emissions, etc. If we can fundamentally solve it, then we will be able to see blue skies and white clouds. What do you think? Just some ideas, don’t comment if you don’t like them.
Question 2: Is the summer smog serious in Beijing? Summer is less severe than winter. Reason: There is much haze in winter because the atmospheric stratification is too stable and pollutants cannot spread to the outside. When the cold air comes, the haze will disappear and get better. In summer, the southeastern summer monsoon prevails in my country, and the rainy season is concentrated in July and August in the north. It is believed that the haze will Somewhat relieved. Of course, the root cause of smog is humankind's high-intensity industrial activities. Air pollution is serious, especially in megacities like Beijing, which is a huge source of pollution. Treating symptoms such as cold weather precipitation, but not the root cause, only alleviates smog. Wear a mask when going out. Disposable masks are the cheapest. They cost 5 yuan for a pack. It doesn’t hurt at all to replace them. But don’t expect them to be able to prevent haze. The filtration and sealing properties are poor, and the anti-droplet protection is barely adequate.
n Prowessin meets the highest standards for medical masks in the United States, has good filtration properties, and prevents not only particles but also droplets. The filtration efficiency for particles as small as 0.1 microns reaches 99.8, and the filtration efficiency for bacteria or viral vectors (common in droplets) as small as 0.3 microns reaches 99.9. Using SecureFit patented technology, it can be adjusted to adapt to different face shapes to achieve a high fit. At the same time, the six-point support disperses pressure, leaving no marks on the face and making it very comfortable to wear. But the price is not very affordable, one piece costs 29 yuan...on Tmall
n 3M is an old brand, the price is neither high nor low, and the protective effect is systematically graded. After all, we are making industrial masks, and we don’t think too much about user experience in design and manufacturing. I felt a slight smell when I first put it on, and the elastic band ruined my hair style and was painful. Sometimes I just put one on to save trouble. A rubber band, I was worried that the protective effect would be greatly reduced, but I made do with it for the sake of comfort. n The workmanship of Green Shield is average, the facial fit is poor, and the technological content of the entire design is not high. The filter element can only cover a small area of ??the mouth and nose, and unfiltered air will still enter the respiratory system through the cotton cloth around the filter element, continuing to harm the wearer. The colorful cotton design is not classy enough either.
Question 3: Will there be haze in summer? Why is there no haze in summer? There are many sources of haze, such as car exhaust, industrial emissions, construction dust, garbage burning, and even volcanic eruptions. Fog Haze weather is usually caused by a mixture of multiple pollution sources. However, in haze weather in various regions, the role of different pollution sources varies.
Smog has existed since ancient times. Human activities or natural phenomena such as slash-and-burn farming and volcanic eruptions may cause haze. However, after humans entered the fossil fuel era, haze weather truly threatened the human living environment and health. Rapid industrialization and urbanization have led to rapid energy consumption, high population concentration, and destruction of the ecological environment, all of which have paved the way for the formation of haze weather.
The formation of haze has both "sources" and "accomplices", which are meteorological conditions that are not conducive to the spread of pollutants. Once pollutants accumulate under long-term static meteorological conditions, it is easy to form fog. Haze weather. There are three elements in the formation of haze:
First, the physical source of particulate dust. my country has the largest Loess Plateau area in the world, and its soil texture is most prone to generating granular dust particles.
The second is the dust caused by poor movement.
For example, if the mud in the flowerbeds in the middle of the road or on the street curbs flows onto the road after it rains or is splashed with water, it will dry up for an hour and be turned around by the wheels, causing a large amount of dust. Even if these particulate matter falls back to the ground, it will cause dust. Cars kept passing by and were flung over the city again.
The third is that the dust source and movement difference process are concentrated within a certain spatial range, and the particles eventually condense with water molecules to form haze. At present, there are quite abundant stocks of the three elements of haze structure in more than 350 cities in the Loess Plateau region of my country.
The temperature is high in summer and water evaporates quickly, which is not conducive to condensation, so there is almost no haze in summer
Question 4: Will there be haze days in summer? There should still be days, but compared to There are fewer occurrences in winter
Question 5: Is smog serious in summer? The generation of haze is generally due to two reasons: one is the source of pollution, and the other is suitable meteorological conditions.
Simply defining good weather without haze and bad weather with haze is very crude and unreasonable. The meteorological conditions that generate haze cannot be summed up in one word, but one of the important influencing conditions is atmospheric stability.
In layman's terms, the vertical convection of the atmosphere under stable conditions is weak and haze is likely to occur, while the atmospheric convection under unstable conditions is strong and haze is less likely to occur. Atmospheric stability is related to the energy received by the surface, topography and other aspects, but it also has obvious seasonal and time characteristics, mainly as follows:
1. It is easier to produce a stable atmosphere in winter than in summer
p>2. It is easier to produce a stable atmosphere at night than during the day
Therefore, in terms of atmospheric stability, haze is more likely to occur in winter than in summer, and haze is more likely to occur at night than at noon. However, it should also be noted that there is a stable atmosphere even in summer, so it is possible for haze to occur in summer.
Question 6: Why is the air quality better in summer than in winter? Less smog? 1. What is fog? Fog is a physical phenomenon caused by a large number of water droplets and living ice crystals suspended in the air near the ground, making the horizontal visibility less than 1KM. The basic conditions for the formation of fog are abundant water vapor in the air near the ground, a cooling process that causes water vapor to condense, and the existence of condensation nuclei. When the water vapor pressure in the air layer close to the ground is greater than its saturated water vapor pressure, the water vapor condenses or sublimates into fog. The most common are radiation fog and advection fog. And the fog and radiation fog in North China. Radiation fog is formed by ground radiation cooling and the cooling of the air layer close to the earth. The conditions for the formation of radiation fog are: 1. Sufficient water vapor 2. Sunny weather with few clouds 3. Weak wind (1-3m/s) 4. The atmosphere structure is stable. The thickness of radiation fog depends on the degree of cooling of the air and the strength of the wind. High fog is an increase in the height reached by the cooling effect of the air. Radiation fog can extend to hundreds of meters high and has a wide range. It can last for many days and only weakens slightly during the day. Radiation fog appears on clear nights in high pressure areas, and its appearance often indicates clear weather. For example, in the winter half of the year, mainland my country is mostly controlled by high pressure and the nights are long, which is conducive to the formation of radiation fog. Therefore, it can be seen that winter in North my country is inherently foggy. In and around cities, there are a lot of smoke particles and dust, and there are abundant condensation nuclei, so it is particularly easy to form dense fog (often called urban fog). Okay, I'm heartbroken. ①. There is sufficient water vapor, there are a lot of smoke particles, dust, and condensation nuclei. Abundant GET ②, clear weather with few clouds is controlled by the subtropical high pressure, clear GET ③, weak wind (1-3m/s) controlled by the subtropical high pressure zone, little convective movement GET ④, and stable atmosphere structure. Deputy high. . . GET 2. Temperature inversion The temperature inversion formed due to the strong radiation cooling of the ground is called radiation inversion. Figure 2-35 shows the generation and elimination process of radiation inversion. A in the figure shows the vertical distribution of air temperature before the formation of radiation inversion; on a clear, cloudless or cloudless night, the ground cools quickly through radiation, and the air layer close to the ground also cools down.
Since the closer the air is to the ground, the greater the influence of the surface is. Therefore, the closer to the ground, the greater the cooling, and the further away from the ground, the less cooling, thus forming a temperature inversion starting from the ground (Figure 2-35b); As the ground radiation cooling intensifies, the temperature inversion gradually expands upward, reaching its strongest at dawn (c in Figure 2-35); after sunrise, solar radiation gradually increases, the ground quickly warms up, and the temperature inversion gradually moves from bottom to top. The ground disappears (d, e in Figure 2?35).
Question 7: Why is there haze in summer? Doesn’t it mean that haze only occurs in winter? Now that the weather is hot, why is the air pollution index still so bad? Smog has a certain relationship with the seasons, but it is not the season that causes the haze. The reason why the haze is more serious in winter is because the vegetation withers in winter, so we cannot control the haze. Effective control, while in summer the branches and leaves are luxuriant, able to absorb haze. Therefore, only by understanding the root causes of smog can we solve air pollution. The main causes of smog are high-energy pollutants, vehicle exhaust emissions, etc. If we can fundamentally solve it, then we will be able to see blue skies and white clouds. What do you think? Just some ideas, don’t comment if you don’t like them.
Question 8: Is the summer smog serious in Beijing? Summer is less severe than winter. Reason: There is much haze in winter because the atmospheric stratification is too stable and pollutants cannot spread to the outside. When the cold air comes, the haze will disappear and get better. In summer, the southeastern summer monsoon prevails in my country, and the rainy season is concentrated in July and August in the north. It is believed that the haze will Somewhat relieved. Of course, the root cause of smog is humankind's high-intensity industrial activities. Air pollution is serious, especially in megacities like Beijing, which is a huge source of pollution. Treating symptoms such as cold weather precipitation, but not the root cause, only alleviates smog. Wear a mask when going out. Disposable masks are the cheapest. They cost 5 yuan for a pack. It doesn’t hurt at all to replace them. But don’t expect them to be able to prevent haze. The filtration and sealing properties are poor, and the anti-droplet protection is barely adequate.
n Prowessin meets the highest standards for medical masks in the United States, has good filtration properties, and prevents not only particles but also droplets. The filtration efficiency for particles as small as 0.1 microns reaches 99.8, and the filtration efficiency for bacteria or viral vectors (common in droplets) as small as 0.3 microns reaches 99.9. Using SecureFit patented technology, it can be adjusted to adapt to different face shapes to achieve a high fit. At the same time, the six-point support disperses pressure, leaving no marks on the face and making it very comfortable to wear. But the price is not very affordable, one piece costs 29 yuan...on Tmall
n 3M is an old brand, the price is neither high nor low, and the protective effect is systematically graded. After all, we are making industrial masks, and we don’t think too much about user experience in design and manufacturing. I felt a slight smell when I first put it on, and the elastic band ruined my hair style and was painful. Sometimes I just put one on to save trouble. A rubber band, I was worried that the protective effect would be greatly reduced, but I made do with it for the sake of comfort. n The workmanship of Green Shield is average, the facial fit is poor, and the technological content of the entire design is not high. The filter element can only cover a small area of ??the mouth and nose, and unfiltered air will still enter the respiratory system through the cotton cloth around the filter element, continuing to harm the wearer. The colorful cotton design is not classy enough either.
Question 9: Will there be haze in summer? Why is there no haze in summer? There are many sources of haze, such as car exhaust, industrial emissions, construction dust, garbage burning, and even volcanic eruptions. Fog Haze weather is usually caused by a mixture of multiple pollution sources. However, in haze weather in various regions, the role of different pollution sources varies.
Smog has existed since ancient times. Human activities or natural phenomena such as slash-and-burn farming and volcanic eruptions may cause haze. However, after humans entered the fossil fuel era, haze weather truly threatened the human living environment and health. Rapid industrialization and urbanization have led to rapid energy consumption, high population concentration, and destruction of the ecological environment, all of which have paved the way for the formation of haze weather.
The formation of haze has both "sources" and "accomplices", which are meteorological conditions that are not conducive to the spread of pollutants. Once pollutants accumulate under long-term static meteorological conditions, it is easy to form fog. Haze weather.
There are three elements in the formation of haze:
First, the physical source of particulate dust. my country has the largest Loess Plateau area in the world, and its soil texture is most prone to generating granular dust particles.
The second is the dust caused by poor movement. For example, if the mud in the flowerbeds in the middle of the road or on the street curbs flows onto the road after it rains or is splashed with water, it will dry up for an hour and be turned around by the wheels, causing a large amount of dust. Even if these particulate matter falls back to the ground, it will cause dust. Cars kept passing by and were flung over the city again.
The third is that the dust source and movement difference process are concentrated within a certain spatial range, and the particles eventually condense with water molecules to form haze. At present, there are quite abundant stocks of the three elements of haze structure in more than 350 cities in the Loess Plateau region of my country.
The temperature is high in summer and water evaporates quickly, which is not conducive to condensation, so there is almost no haze in summer
Question 10: Will there be haze days in Beijing in summer? It can only be predicted. estimate. Summer is less severe than winter. Reason: There is much haze in winter because the atmospheric stratification is too stable and pollutants cannot spread to the outside. When the cold air comes, the haze will disappear and get better. In summer, the southeastern summer monsoon prevails in my country, and the rainy season is concentrated in July and August in the north. It is believed that the haze will Somewhat relieved. Of course, the root cause of smog is humankind's high-intensity industrial activities. Air pollution is serious, especially in megacities like Beijing, which is a huge source of pollution. Treating symptoms such as cold weather precipitation, but not the root cause, only alleviates smog.