Dense fog shrouds east and north China

Fog covers the airport in Urumqi, capital city of Northwest China's Xinjiang Uygur autonomous region on Nov 27, 2011. Forty-four flights were affected by the fog and 13 flights were canceled. [Photo/Xinhua]

Passengers wait at the Urumqi International Airport in the capital city of Northwest China's Xinjiang Uygur autonomous region on Nov 27, 2011. Numerous flights were delayed in and out of Urumqi due to heavy fog in the city. [Photo/CFP]