It is always foggy in winter. Is the sky haze or fog?

Simply put, fog is small water droplets in the air, while haze is solid particles in the air.

In winter, fog is actually very common and normal in many cities due to outdoor temperature and other reasons. But now the air pollution is serious, and there are a lot of particles in the air every day, which has a great impact at ordinary times. In addition, there is generally no wind in foggy days, and pollutants are easy to accumulate. In addition, small water droplets floating in the air can easily adsorb particles, making them * * * isomorphic.

Therefore, it is mostly smog now!