Orange pollution alert raised as Beijing smog reaches 'hazardous' levels
Pollution level at the highest – “hazardous” – level meaning air quality is a health threat to the entire population as roads are closed and schools told to limit outdoor activities

Thick smog blanketed Beijing for a second day yesterday, putting the city on a higher air pollution alert and forcing its dirtiest factories to cut fumes by 30 per cent.
The capital raised its pollution alert from yellow to orange - the second-highest level on a four-tier warning system - at about noon, with the contamination remaining hazardous throughout the day.
Beijing's official Air Quality Index reached 470 at 4pm. A reading of over 300 is considered severe pollution.
Toxic smog also blanketed nearby cities - mostly in Hebei and Shanxi provinces - including Xingtai , Shijiazhuang , Dingzhou and Yangquan . Eighteen highways linking Beijing, Harbin and Shanghai had to be closed, according to the China Meteorological Administration.
Watch: Beijing smog reaches 'hazardous' levels