In January 2013, a suffocating, poisonous haze hung over Beijing for four days. The record high levels of fine particulate matter in the air caused airports to close and thousands of coughing, choking citizens to seek hospital care.
In January 2013, a suffocating, poisonous haze hung over Beijing for four days. The record high levels of fine particulate matter in the air caused airports to close and thousands of coughing, choking citizens to seek hospital care.