What are the hazards of sandstorms? Can it be protected by installing a home fresh air system?

Medical experts have warned that the air is seriously polluted in windy and dusty weather, which can easily lead to respiratory diseases. It is best not to go out at this time, and it is not appropriate to open the window at home. Being closed indoors for a long time will aggravate indoor air pollution, and the stagnant air will lead to dizziness, nausea, poor breathing and other symptoms, especially for the elderly and children with weak constitution. It is suggested to open the fresh air system to filter dust, and at the same time, it can realize ventilation without opening the window and enjoy fresh oxygen breathing at all times.

For example, the general fresh air system is equipped with four progressive filtration and purification devices: coarse filtration+medium filtration+gas phase molecular sieve+high efficiency filtration, which can purify particles such as dust and hair to micron level in turn. H 13 medical grade HEPA high efficiency filter has a purification rate of over 99.9% for 0.3 micron particles. Therefore, the purification effect of fresh air system on PM 10 and PM2.5 (the primary pollutant of dust) is completely self-evident.