source: statista.com |
See http://www.stateair.net/
How the US Embassy Tweeted to Clear Beijing's Air | WIRED.com:
"In 2008, everyone knew Beijing was polluted, but we didn't know how much. That year, the US Embassy in Beijing installed a rooftop air-quality monitor that cost the team about as much as a nice car. The device began automatically tweeting out data every hour to inform US citizens of the pollution’s severity @beijingair [embed below]."Tweets by BeijingAir