Extreme air pollution in the Chinese capital Beijing has prompted authorities to increase the level of health warnings and order the temporary shut down of more than 100 factories.<br /><br />Authorities urged the city's 20 million people on Wednesday to stay indoors and shut windows, eat a "balanced diet" and drink plenty of water. A third of all government vehicles have also been ordered off the road. <br /><br />Al Jazeera's weather anchor Steff Gaulter reports on the latest
