Social media posts can help researchers estimate air pollution levels with significant accuracy, according to a team of computer scientists from the University of Wisconsin.
The researchers analyzed posts on Weibo — a Twitter-like site that is China’s most popular social media outlet — from 108 Chinese cities over 30 days, tracking how often people complained about the air and the words they used to describe air quality.
The study showed that the process can provide accurate, real-time information on the air quality index, a widely used measure of common air pollutants. Large Chinese cities sometimes have physical monitoring stations to gauge pollution levels, but smaller cities generally do not because monitors are expensive to install and maintain.
The researchers hope these findings will help residents of smaller towns and less affluent areas understand the severity of their local air pollution. Between 350,000 and 500,000 Chinese citizens die prematurely each year because of air pollution, a former Chinese health minister estimated in the journal The Lancet.



The release last month of a joint announcement by Greenpeace and Facebook marks the end of one of the most interesting green campaigns of recent years. Greenpeace first targeted Facebook 20 months ago, after the social media giant announced a new purpose-built data center, which it turned out would
Location technologies are transforming how we experience, navigate, and ultimately better our world. From the global to the local, here are #10Ways geolocation is a positive force for good.