Under the continuous sandstorm weather in Beijing, which is more harmful, smog or sandstorm?

I feel that the hazards of smog and sandstorm cannot be simply compared. Haze is a general term for fog and haze, also called haze. It means that a large number of extremely fine dry dust particles such as dust, sulfuric acid, nitric acid and organic hydrocarbons in the air float evenly in the air, which makes the air turbid, blurs the vision and deteriorates the visibility. If the horizontal visibility is less than 10000 meters, the visual distance obstacle caused by this non-aqueous aerosol system is called haze or haze. When water vapor condensation intensifies and air humidity increases, haze will turn into fog. Sandstorm is a general term for sandstorm and sandstorm, which refers to a serious sandstorm weather phenomenon in which strong winds blow up a large amount of dust substances on the ground and drag them into the air, making the air particularly turbid and the horizontal visibility less than one kilometer. Haze contains a large number of particulate harmful substances, which, if inhaled, will do harm to human respiratory system, cardiovascular system and urogenital system, especially to people with poor cardiopulmonary function. In foggy days, if they go out without proper protective measures, they may not come back. Therefore, during the severe smog weather in Beijing, many enterprises take vacations, and residents will try not to go out. The economic losses caused by smog are very serious. Sandstorm, as a disastrous weather with the interaction of wind and sand, not only has the harm of smog, but also directly damages buildings and land and reduces crop yield. The control of smog and sandstorm is equally difficult, which requires a lot of manpower, material resources and financial resources. In this respect, there is little difference in the degree of harm between the two. So in terms of harm, I still think that sandstorms are more harmful.