Fog is a system of aerosols consisted of tiny drops or ice crystals flowing in the ground layer with invisibility below 1km. Generally speaking, the main distinction between fog and dust-haze lies in how much water there is: moisture content in dust-haze is below 80%, while when there is more than 80% but lower than 90% it is called the mixture of fog and dust-haze, most of which is dust-haze.
Concerning about the visibility: if the target item can not be seen beyond 1km, it is fog; if the horizontal visibility is between 1-10km, it is light fog or mist; if the horizontal visibility is less than 10km as a result of dust particles, it is haze or dust-haze.
Besides, some differences between fog and haze can be seen by humans: the thickness of fog is only several dozens of meters to 200 meters, while haze can cover the width of 1km to 3km; fog is milky white or bluish white, while haze looks yellow or orange gray; the border of fog is quite clear, sunny days always hide out of the ‘fog area’, while there is no obvious dividing line between haze areas and the environment around.
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