The reason of more fog in Chongqing is its geography. Chongqing, located in the southeastern part of the Sichuan Basin, where the Changjiang and Jialing rivers meet. The vaporization of the river is not easy diffused.

The humid air keeps saturation and coagulates to fog. The days of foggy is not known in China but all over the world. There are even more than some famous international foggy cities. Average foggy days in Chongqing are 104 each year. London in Britain which called world foggy capital only has average 94 days each year. Tokyo in Far East which also called foggy capital has only 55 foggy days every year. So Chongqing is the real foggy city. Bishan county in Chonqing has average 204 foggy days.

Chongqing's nickname as the " Fog City " or " Furnace " is no exaggeration. Annual average temperature is 18 C to 20 C, with the lowest temperature of 6 C in winter and the highest temperature of 38 C in summer. One will enjoy a warm winter but a hot summer. Annual average rainfall is about 1000 (39.4 inches) to 1400 (55.12 inches) millimeter. Chongqing has plenty of night rain all year round. So the best time to visit Chongqing should be in spring, autumn and winter.

In heavy foggy days, the total peninsula covered in fog. The ferry is forbidden and ships stay at the port. Car run slowly with lights in the fogy. The traffic jam increased immediately. People only see the objects in front of 10 meters in the fog. The fog makes a lot of inconvenient to people. But the fog also brings the charming foggy view for people. In heavy foggy day the mountain city suffuses in the fog. If you meet the foggy day at Chongqing, you can comprehend the view of foggy city.Only you are in the foggy city, you may understand it.