There are millions of people in living in Beijing who for many days of the year must step out their door and suffer the heavy blanket of smog enveloping the city. In 2013 records were broken when PM2.5 readings surged to 886 µg/m3, far beyond the level deemed acceptable by the World Health Organization, which is a 25 µg/m3 mean over a 24 hour period.
© Greenpeace / Natalie Behring