Heavy fog in Shanghai disrupted air and road transport on Thursday morning, said local officials.

Four highways were closed entirely or partially due to the heavy fog.

Over 20 flights at Pudong Airport and Hongqiao Airport were postponed and one flight to Guangzhou was canceled after 6:00 AM. The flights were resumed gradually when the fog faded, according to the airport officials.

Boats on Changjiang River were canceled due to the reduced visibility.

(Xinhua News Agency February 9, 2007)