Beijing on orange alert for smog
In some Chinese cities in recent years, the concentration of airborne particles, called PM 2.5, averaged nine times the safe level defined by the World Health Organisation [Xinhua]
As winter quickly approaches, the Chinese capital Beijing once again finds itself in the throes of an air pollution crisis as authorities signal an orange alert for smog for the second consecutive day.
China’s color code alerts include red – as the most dangerous and lethal, followed by orange, yellow and blue.
