Why is the air quality worst when it s foggy?

Due to the recent stability of the atmospheric structure, the high humidity of the near-surface air, the weak ground pressure field, the low wind, and the low night temperature, the fog appears. The air quality is the worst because the atmosphere is in a stable state, with neither vertical movement nor horizontal flow, which prevents the pollutants in the air from diffusing, resulting in haze.

Fog is made up of tiny droplets of water that dissolve and suspend large amounts of pollutants.

Because everyone lined up the things they didn't want in the air!!

Yes. In the past, everyone thought that fog was caused by water vapor, but it may not matter, but in fact, there are particles in fog water, so fog means that there must be pollutants in it. In fact, even in cities where there is no pollution, foggy days are not a good activity day because of the large amount of particulate matter.

If combined with the current increase in air pollution, the pollution content in the fog increases, so it is necessary to minimize going out on foggy days and shorten the time spent outdoors.

Remember to adopt it.

There are still a lot of solid particles.

Yes, fog is evidence that the air is very dirty,,, fog is a droplet suspended in the air,,, these droplets are adsorbed on the dust,,, if there is fog, going out to exercise is equivalent to self-harm,,, in fact, the morning is similar to the evening, you can check the Internet every day,,, you know how dirty the air is.

Hello students, first of all, we must understand that fog is formed when water vapor is liquefied into small water droplets at cold temperatures, and the small water droplets are covered with suspended particles (such as dust, etc.) in the air. Therefore, it goes without saying that the more suspended particles in the air, the thicker the fog, then the worse the air quality. In winter, the fantastic fog you see is actually a beautiful trap for the dust to give you.

Remember to wear a mask in foggy weather

The water vapor in the air needs to rely on the particles suspended in the air to condense into water droplets, and the moist dust is more likely to be deposited in the respiratory tract and lungs, so the air is not good in the morning of fog.

Plants do not photosynthesize at night, and respiration strengthens oxygen absorption and emits carbon dioxide, so the oxygen content of the air in the morning is low.

However, human activity will raise dust, and there will be less human activity at night, so there are fewer suspended particles in the air in the morning and more in the evening. A low oxygen content does not mean that the air quality is bad. If you have the habit of exercising in the morning, you can just avoid foggy weather, and you don't need to deliberately change your original habits.

Summary. For example, tropical rainforests have a lot of precipitation and foggy days throughout the year, but the air quality is very high.

Is foggy weather a bad air quality?

Is foggy weather a bad air quality? :No. Foggy days are characterized by poor visibility, but they do not necessarily mean poor air quality, and should be combined with the causes of foggy days.

If it is a hazy day, the air quality is poor, and if it is a normal foggy day after rain, the air quality is better than that of a sunny day, because the small water droplets in the air will have a precipitation effect on the dust.

For example, tropical rainforests have a lot of precipitation and foggy days throughout the year, but the air quality is very high.

Air Quality Index for foggy days.

Do you have any questions about the AQI.

To a certain extent, smog is very harmful to people's bodies, and it is also very inconvenient for travel.

As the name suggests, smog is a mixture of fog and haze, and everyone knows that fog is a small condensed droplet. And then the haze is that kind of solid little particles. It is the dust in our daily life, as well as the waste particles discharged from the factory, as well as some hydrides, which are then suspended in the air and combined with the fog to cause the current haze weather.

Most of the small particles contained in the haze are harmful to the human body, inhaling too much will cause great harm to our body, I am now in college, the city is Tianjin, which is a place with severe haze weather, many times in winter will appear on the mobile phone, haze orange warning, please pay attention to travel safety, and then you have to buy that anti-smog mask,,of. We can't buy too cheap ones yet, I'm afraid it won't work, so we can only buy better ones. Every winter, buying anti-smog masks costs a lot of money.

Haze weather will also reduce visibility, in the winter of Tianjin we often block the highway today is a very common thing, sometimes the visibility is less than 100 meters, everyone vehicles are on the tail lights when traveling, so that everyone can see the distance between cars, every year because of the haze weather caused by a lot of traffic accidents, so it brings great convenience to people's travel.

Smog has brought great harm to our bodies and lives, and I think it is necessary to control the momentum of haze.

To control haze weather, I think we should reduce the dust in our daily life as well as the system requirements for factories and the treatment of car exhaust, and then for factories, we should require each factory to install a purifier to reduce a large amount of particulate matter into the air as much as possible, and then install a purifier at the tail end of the car to reduce the discharge of harmful gases, which can reduce the harm of haze to the human body.

The mountains are clouds, not fog.

Both fog and clouds are formed by the condensation of water vapor, except that the base of the cloud does not touch the ground, while the fog touches the ground. Therefore, it can be said that fog is a cloud on the ground.

Depending on the level visibility, fog can be classified as heavy fog, dense fog, heavy fog, medium fog, and light fog. The horizontal visibility distance of heavy fog is less than 50 meters; The horizontal visibility distance of the dense fog is between 50 and 200 metres; The horizontal visibility distance of fog is between 500 and 1000 m, and the visibility distance of light fog is more than 1000 m.

According to the different causes, fog can be divided into radiation fog, advection fog, vapor fog, uphill fog, frontal fog and so on. Radiation fog is formed when the ground air is cooled by radiation at night to reach a state of supersaturation of water vapor. This fog mostly occurs at night and in the morning when it is clear, breezy and has plenty of moisture near the ground.

The appearance of radiation fog generally indicates that the weather is fine on the day, so there is a saying that "ten fogs and nine sunshines". Advection fog is caused by the horizontal flow of air. When warm and moist air flows through the cold ground or sea surface, the lower layers of the air cool down as they touch the ground or sea surface, causing the water vapor to condense into a fog.

The appearance of advection fog generally indicates that rain is going to fall within two or three days. Frontal fog occurs in frontal areas where warm and cold air masses collide. This kind of frontal fog often appears in the rainy season in China, and it is also a harbinger of rainy weather.

Fog has a big impact on navigation, aviation, and crops. For example, once the sea voyage encounters dense sea fog, the ship may lose its direction, and even run aground, run aground, collide and other accidents; It will be difficult for the aircraft to take off or land in foggy weather; Crops can be affected in consistently foggy and cold weather, both yield and quality.

Diffuse fog is a weather phenomenon that often occurs in early winter, such fog, in addition to affecting transportation, bringing inconvenience to people's travel, there are many hazards, should cause people to attach great importance to it.

Fog is a condensation of water vapor in the air. According to measurements, the proportion of harmful substances such as various acids, alkalis, salts, amines, phenols, and pathogenic microorganisms in the droplets is dozens of times higher than that of ordinary atmospheric water droplets. The harm of fog to human health has great concealment, the diffuse fog, hazy, picturesque scenery, attract people to exercise and play in the fog, with the increase of activity, people's breathing is bound to deepen, accelerate and naturally absorb more harmful substances in the fog, so that it is easy to induce or aggravate tracheitis, pharyngitis, conjunctivitis and many other diseases.

Therefore, in foggy weather, outdoor activities should be stopped as much as possible, especially some strenuous activities, you must travel, and you must do a good job of protection.

Fog indicates that the air quality is not good, and it means that the air contains a lot of floating dust that condenses into small water droplets.