1. The form is different: fog is small particles of water droplets suspended in the air, while haze is a small solid particles suspended in the air, composed of dust, sulfuric acid, nitric acid and other various compounds.

2. The color is different: fog is composed of small droplets of water, due to its physical properties, scattered light and wavelength relationship is not large, so the milky white, greenish white or pure white. Haze is composed of various compounds, due to its physical properties.

3. Thickness is different: the thickness of the fog is generally 50-200 meters. Because the small droplets of water have a greater mass, by gravity, the cloud will be close to the ground. And the thickness of the haze is generally 1-3 kilometers. Because the haze particle mass.

4. Humidity is different: fog is the relative humidity of 90% or more of the air suspension, the emergence of fog, the air is humid. And haze is the relative humidity of less than 80% of the air suspension, the emergence of haze, the air is relatively dry.

5. Distribution is different: fog in the air distribution is not uniform, the closer to the ground the greater the density. Haze particles are smaller, lighter, and more evenly distributed in the air.

The conditions that produce haze:

Haze and haze are often accompanied by a wide range of hazy weather, once formed, under favorable weather conditions can be maintained for several days. Weather conditions favorable to the maintenance of haze include: first, the wind is small, is not conducive to the diffusion of pollutants in the horizontal direction; second, the low altitude atmospheric layer junction is stable, and the near-surface is prone to inversion of the temperature layer. Not conducive to the vertical upward diffusion of pollutants, making pollutants accumulate in the atmospheric boundary layer.