‘Click-click.” Zou Yi, founder of social media account BeijingAirNow, stood on the flyover close to the China World Trade Center in Beijing’s central business district, taking pictures of the sky with his cellphone. His dog, named Baiyou, which means tar or pitch, sat quietly next to him.
“I have persisted in recording the changes in Beijing’s air quality every day since 2013. And now, a decade has passed,” Zou said. Although he had a cold, he still wrapped himself up in a coat and took Baiyou to three locations, the China World Trade Center, Beijing Radio and Television Station, and CITIC Tower, Beijing’s tallest building, to photograph the sky. As usual, the sky over Beijing was azure.
However, 10 years ago, any shade of blue sky was far less common.…