Buildings are shrouded in a dense smog near the CBD (Central Business District) area in Beijing, capital of China, Jan. 12, 2013. Beijing was shrouded in dense smog for a second straight day Saturday. The smoggy weather will not clear up until Monday, the city's environment monitoring center said. Beijing's air is heavily polluted. Readings for PM2.5, or airborne particles with a diameter of 2.5 microns or less, small enough to deeply penetrate the lungs, were as high as 456 on Saturday. Photo: Xinhua
Buildings are shrouded in a dense smog near the CBD (Central Business District) area in Beijing, capital of China, Jan. 12, 2013. Beijing was shrouded in dense smog for a second straight day Saturday. The smoggy weather will not clear up until Monday, the city's environment monitoring center said. Beijing's air is heavily polluted. Readings for PM2.5, or airborne particles with a diameter of 2.5 microns or less, small enough to deeply penetrate the lungs, were as high as 456 on Saturday. Photo: Xinhua
Vehicles move amid a dense smog near the CBD (Central Business District) area in Beijing, capital of China, Jan. 12, 2013. Beijing was shrouded in dense smog for a second straight day Saturday. The smoggy weather will not clear up until Monday, the city's environment monitoring center said. Beijing's air is heavily polluted. Readings for PM2.5, or airborne particles with a diameter of 2.5 microns or less, small enough to deeply penetrate the lungs, were as high as 456 on Saturday. Photo: Xinhua
Cars run on a street in dense fog in Baoding, North China's Hebei Province, Jan. 12, 2013. Heavy fog enveloped several regions in east and central China Saturday, causing highway closures and flight delays in several provinces. Photo: Xinhua
Vehicles move on a street in dense fog in Baoding, North China's Hebei Province, Jan. 12, 2013. Heavy fog enveloped several regions in east and central China Saturday, causing highway closures and flight delays in several provinces. (Xinhua/Wang Xiao)
Two visitors wearing masks are seen at the fog-enveloped Temple of Heaven in Beijing, capital of China, Jan. 12, 2013. Heavy fog hit Beijing on Saturday. Photo: Xinhua
Visitors walk at the fog-enveloped Temple of Heaven in Beijing, capital of China, Jan. 12, 2013. Heavy fog hit Beijing on Saturday. Photo: Xinhua
A car runs on a street in dense fog in Baoding, north China's Hebei Province, Jan. 12, 2013. Heavy fog hit many parts of Hebei Province on Saturday. The visibility was less than 200 meters in some areas. Photo: Xinhua
A person rides on a street in dense fog in Baoding, North China's Hebei Province, Jan. 12, 2013. Heavy fog hit many parts of Hebei Province on Saturday. The visibility was less than 200 meters in some areas. Photo: Xinhua
People ride on a street in dense fog in Baoding, north China's Hebei Province, Jan. 12, 2013. Heavy fog hit many parts of Hebei Province on Saturday. The visibility was less than 200 meters in some areas. Photo: Xinhua
Fog-shrouded buildings are seen in the Honggutan New District of Nanchang City, capital of East China's Jiangxi Province, Jan. 12, 2013. A fog hit many parts of Jiangxi on Saturday. Photo: Xinhua
Fog-shrouded buildings are seen in the Honggutan New District of Nanchang City, capital of East China's Jiangxi Province, Jan. 12, 2013. A fog hit many parts of Jiangxi on Saturday. Photo: Xinhua
Buildings are seen amid dense fog in Wuhan City, capital of Central China's Hubei Province, Jan. 12, 2013. Photo: Xinhua
Buildings are seen amid dense fog in Wuhan City, capital of Central China's Hubei Province, Jan. 12, 2013. Photo: Xinhua
Buildings are seen amid dense fog in Wuhan City, capital of central China's Hubei Province, Jan. 12, 2013. Photo:Xinhua