COP21: Beijing chokes in hazardous pollution as President Xi attends Paris climate summit

As Chinese President Xi Jinping attended a crucial climate conference in Paris, pollution reached its worst level of the year in Beijing, with authorities maintaining a rare "orange" alert for a second consecutive day. Schools in the Chinese capital suspended outdoor activities as the city of 12 million people was choked in a cloud of thick grey smog. Monitoring sites recorded pollutants filling the air at extremely hazardous levels, more than 20 times higher than considered safe by the World He