Commuters at bus stops in Beijing, Kunming, Shenzhen, Xi'an and Zhengzhou can decide if they were feeling happy or unhappy as part of a campaign to see how happy people are across China.

Passengers take part in a campaign to gauge how happy people are at a bus stop in Beijing on July 20, 2011. [Photo / CFP]

People can press a button on bus stop billboards to tell if he is happy or not, and an LCD screen displays a running total of results.

In addition, people can take part in the campaign by expressing their emotions through twitter-like micro blog site, the Sina Weibo.

The campaign will run until August 2, when the organizer will then analyze results.