What should I pay attention to in general foggy weather in Beijing?

Breathing protection must be done in foggy days.

Haze is a combination of fog and haze, but there is a big difference between fog and haze. The aerosol system composed of dust, sulfuric acid, nitric acid and other particles in the air causes visual obstacles. Fog is an aerosol system composed of a large number of tiny water droplets or ice crystals suspended in the air near the ground.

Haze weather is a state of air pollution, and smog is a general manifestation of suspended solids exceeding the standard in the atmosphere, especially PM2.5 (particles with aerodynamic equivalent diameter less than or equal to 2.5 microns) is considered to be the culprit. With the deterioration of air quality, cloudy days are increasing and the harm is increasing. In many areas of our country, the phenomenon of haze weather is combined with fog as an early warning and forecast of harmful weather, which is collectively called haze weather.

You need to wear a professional mask when you go out in foggy days, which can effectively avoid the harm of smog. In GB2626-2006, the country clearly stipulates that the dust-proof efficiency of dust masks can be divided into three grades: KN90, KN95 and KN 100, among which KN 100 dust masks can protect ultrafine dust more than 99.97%, which can effectively protect against smog hazards.

Choosing a mask depends not only on the brand, but also on the protection level of the mask.