It's not safe to wear masks or stay at home for a long time.

At 16:40 on June 18th, the theme of the series of interviews organized by the Chongqing Association for Science and Technology on the promotion of science and technology to promote people’s livelihood was the “Scientific interpretation of the causes, harms, and prevention of haze,” and was invited to the Institute of Atmospheric Physics, Chinese Academy of Sciences. Dr. Wang Gengchen, a doctoral advisor, chatted with everyone about topics related to “fog and haze”.

Summer in Chongqing is relatively less hazy

Chongqing has more foggy weather, especially in autumn and winter, and visibility is sometimes only a few meters. So, is the chance of haze in the summer very small?

Wang Gengchen said that the occurrence of hazy weather is closely related to weather conditions. Chongqing is a special place for meteorology, because it is just at the edge of the Sichuan Basin. Its eastern and northern sides are basically mountains. Emissions are not. If you send it out, it will accumulate in this place. Another feature of Chongqing is that the wind is relatively small, so that local pollutants are not easily spread out.

Chongqing is mainly affected by the warm and humid southwest winds. The monsoon from the Indian Ocean and the relatively humid air are blocked by the Himalayas. They can only run here, and follow the air flow to the Sichuan Basin. Therefore, the monsoon has a great impact on Chongqing, especially the summer monsoon. Therefore, after the summer monsoon comes, it will be relatively humid, and it will easily cause precipitation. Precipitation will ease the haze, so Chongqing will have less smog in summer.

The long-term use of masks on smog days not only has no benefit but also affects lung function

Because of fears of haze, many people often choose to wear masks when they go out, or buy air purifiers at home. Are these methods feasible?

Wang Gengchen believes that if there is more severe haze weather, it is best not to long-term activities outside. But no way, we have to go to school, work, and go out. There are many kinds of masks available on the market. Some people have suggested that there are N95 and N90 medical masks that can prevent PM2.5. Wang Gengchen said that they had done experiments. The N95 and N90 have a certain role, but in a short time, for example, if you go to work in a more polluted environment, you must wear it. But it's impossible to wear it for 8 hours a day at work. This can't stand it.

Medicine has done experiments in this area. Wearing masks for a long time is not only unprofitable, but also has disadvantages. Especially for the elderly and children, they are very awkward after wearing them. Even if they can prevent PM2.5, they have a great impact on your lung function and respiratory system. Therefore, we must dialectically and scientifically treat these issues.

Wang Gengchen suggested that traffic police should always be in contact with vehicle exhaust emissions and wear masks when they are on duty, but changing jobs should be done, for example, every hour.

Air purifiers should regularly check the indoor air as a whole is not as good as outdoor

For air purifiers, Wang Gengchen believes that there are many kinds of purifiers and their functions are different. What needs to remind everyone is that you should not think that you have bought a safe deposit. The purifier's cleansing function just bought is normal, but what about testing it again? The decontaminated medium will be aged and saturated, and the ability to adsorb particulate matter will gradually decrease. Even a long time, the body may grow bacteria, so regular inspection, replacement, and activation are required.

Some citizens think that it is a good protective measure to stay home without going out in the fog. However, Wang Gengchen believes that, on the whole, the indoor air is worse than the outdoor ones, especially in large shopping malls, gymnasiums, KTVs, conference rooms and other places. Although compared with the outdoors, the PM2.5 content may be smaller, but due to Many people, the air does not circulate, and other organic matter is even more polluted. Therefore, Wang Gengchen suggested that if it is a good day, it is best to often go outside to exercise, it is necessary to exercise indoors, we must monitor whether the indoor air compliance.

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