Street fog effect

Quick answer：

The street fog effect is a visual technique used in film and video production to simulate the appearance of fog on a street scene. It involves the use of specialized equipment to create a dense, realistic fog that can enhance the atmosphere of a scene. The technique is often used to create a mysterious or eerie mood, or to depict specific weather conditions. In practice, it can be achieved through various means, including the use of fog machines, dry ice, or computer-generated imagery (CGI).