"The difference and connection between cloudy and foggy days"

Difference: cloudy day refers to the condition that the total cloud amount of low clouds is 8/ 10 or above, the sunlight rarely or cannot penetrate through the clouds, and the sky is dark, which belongs to normal weather changes;

Haze, as its name implies, is fog and haze. Haze weather is a state of air pollution, and smog is a general term for all kinds of suspended particles in the atmosphere, especially PM2.5 (particles with aerodynamic equivalent diameter less than or equal to 2.5 microns) is considered as the "culprit" causing haze weather. With the deterioration of air quality, cloudy days are increasing and the harm is increasing. In many areas of our country, the smog weather phenomenon is combined with fog as an early warning and forecast of disastrous weather. Collectively referred to as "haze weather".

Contact: When there is smog, it will be dark, and it will be dark on cloudy days.