The smog in Jiaxing is serious these days.

The similarity between fog and haze is sight distance obstacle. However, the reasons and conditions for the formation of fog and haze are quite different. 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 effective horizontal visibility is less than 1KM in fog. When the effective horizontal visibility is 1- 10km, it is called light fog.

There is actually a difference between "fog" and "haze". Sun Leng, a senior engineer in the Climate System Monitoring Office of the National Climate Center, pointed out that fog refers to the weather phenomenon when the visibility is lower than 1 km due to the condensation of suspended water vapor in the atmosphere. The formation of smog is mainly the result of a large number of suspended particles in the air and meteorological conditions. There are three reasons:

-The phenomenon of static wind in the horizontal direction has increased. The higher the buildings are built in the city, the obstruction and friction of airflow passing through the urban area will be obviously weakened. 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;

-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.

The increase of suspended particles in the air. With the growth of urban population and industrial development, the number of motor vehicles has soared, resulting in a large increase in pollutant emissions and suspended solids, which directly leads to a decline in visibility.

In fact, dust "smog" will also occur in home decoration, and indoor dust is pervasive, which is not only harmful to the health of staff and users, but also increases the cleaning burden. When the dust is serious, it will bring more hidden dangers to the decoration project!

Is the formation of smog weather the cause of automobile exhaust emissions? People in our automobile industry, including the automobile media, don't quite agree that cars are not good. The progress of automobile technology in recent years is still obvious, and it is unacceptable for people to leave the toilet in the car. The smog in Beijing, the car is not the culprit, and later I changed the title, which is not particularly objective. I said that the smog car in Beijing is the culprit, but it is not. At least the car is partly responsible. I just talked about 20%. I have seen 30% in the past, but the official figure is 22%. Beijing media once made a headline, smog in Beijing, cars in Beijing, oil in Tianjin and coal in Hebei. I've seen the standard and I'm impressed. But it is not so accurate, but it is very vivid, which explains many problems and has a sharing rate. With such a large share rate, cars can't run away, but at the same time, we should also see the problem of oil, which directly drags down the emissions of cars. It says here that cars must say engine oil.

There are three reasons for media reports: public trust. Com, February 13. According to the website of the National Meteorological Administration, it was learned from the press conference of China Meteorological Bureau in February that since the beginning of winter, most areas in the central and eastern regions have experienced frequent smog, and the number of haze days is generally more than five days. According to meteorologists, there are three main reasons for smog weather:

1. In June, 5438+ 10, the cold air activity affecting China was weaker than normal, and the wind speed was low. The frequency of atmospheric stability conditions in most parts of central and eastern China is obviously high, especially in North China, which is as high as 64.5%, the highest in 10 years, and it is easy to cause pollutants to accumulate in the near-surface layer, thus leading to frequent haze weather;

Second, the high background concentration of aerosols in winter in China is conducive to the formation of smog;

Third, the smog weather will make the near-surface atmosphere more stable and aggravate the development of smog and air pollution. The formation of haze weather is not only affected by meteorological conditions, but also related to the increase of air pollutant emissions. It is suggested to further strengthen the control and protection of the atmospheric environment, especially to strengthen the multi-department consultation and linkage, improve the emergency emission reduction plan of atmospheric pollutants under static weather conditions, and prevent and control the occurrence of heavily polluted weather.

It is reported that since the winter, there have been 10 ~ 20 days in southern Hebei, Beijing, eastern Shanxi, Shandong, Henan, Anhui, Jiangsu, Shanghai, Zhejiang, Fujian, Hubei, Hunan, most of Jiangxi, western Guangdong, eastern Guangxi, Sichuan and Yunnan, among which most of Jiangsu has more than 20 days. Compared with the same period of normal years, there are more days in southern Hebei, Beijing, Tianjin, Shandong, northern Henan, Anhui, Jiangsu, Shanghai, Zhejiang, Guangdong and eastern Guangxi 1 day, including 3-8 days in Beijing, Tianjin, most of Anhui and Shanghai, and 8 days in northern Shandong, northeastern Anhui, most of Jiangsu, northern Zhejiang and southern Guangdong. In southern North China, central Jiangsu, eastern Sichuan, southwestern Chongqing and western Guizhou, the visibility is less than 1000m for 8 ~/5 days, and less than 500m for 5 ~ 12 days in southern Hebei, northwestern Shandong and eastern Sichuan.