What are the meteorological factors that cause haze weather?

Exhaust gas from industrial production and transportation, exhaust gas from people's daily life, lampblack and road smoke provide the source of PM2.5 for smog.

The particle size and mass of PM2.5 are small and easy to be blown away by the wind. In addition, if the air humidity is high, the moisture in the air will condense into large water droplets with PM2.5 particles as the core.

Therefore, the main meteorological conditions causing smog are: low air humidity and poor air convection, and the winter climate in China, especially in North China, just meets these two conditions, so smog is frequent.

In foggy days, it is necessary to reduce the time of going out and wear an anti-fog mask when traveling. You can install a fresh air system at home. My home decoration is a five-degree, five-constant central fresh air heating and cooling system, which can effectively filter harmful substances in the air, and can also heat and cool, saving a lot of electricity than air conditioning.