Pollution cloaks China - FT.com Air pollution readings in Beijing over the weekend were the worst since records began about four years ago. As dense smog shrouded Beijing and other cities, residents were advised to stay indoors. Air pollution hangs over the skyline as the sun rises over the central business district in Beijing on January 14. Dense smog shrouded the city with pollution at hazardous levels for a fourth day and residents were advised to stay indoors People wearing masks do morning exercises as heavy fog engulfs the city of Fuyang, China. China's meteorological authority issued a yellow alert for smog on Sunday. A thick fog continued to shroud central and eastern parts of China, leading to flight delays and expressway closures over the weekend Labourers work at a construction site as heavy fog engulfs Beijing, with central and eastern parts of China also affected A high-speed train runs on the Xuchang section of Beijing-Guangzhou High-speed Railway as heavy fog cloaks the city. Air quality indices hit their highest levels as the government issued an orange air warning on January 13 and called the situation dangerous Two waster-pickers wear masks at an industrial district in Qingdao city, in eastern China's Shandong province. Monday January 14 marked fifth day of air pollution shrouding Beijing and other major Chinese cities leading to emergency measures, including a reduction of emissions at factories, no outdoor activities for schoolchildren and a stop to some work at construction sites