Chinese city cancels flights in 2nd day of smog alert
Beijing and 22 other Chinese cities imposed emergency measures Saturday, including ordering cars off the road and telling factories and schools to close, after pollution soared to more than 10 times safe levels.
Chinese cities are notorious for noxious air blamed on emissions from older cars and trucks, coal-fired power plants and factories.
Beijing and other cities have tried to improve air quality by switching power plants from coal to natural gas and rolling out fleets of electric buses and taxis.