Danger Maps Backed by Alibaba Pinpoint Chinese Pollution

Danger Maps Backed by Alibaba Pinpoint Chinese Pollution

Tomohiro Ohsumi/Bloomberg

A man wears a mask as he walks down a street in Beijing. “When more people see the pollution, public opinion will add pressure to local authorities and prompt them to make changes,” said Mao Xiaoli, a co-organizer of China Mangrove Conservation Network.