BEIJING, May 13 (Xinhua) -- Beijing Municipality launched a one-month campaign Monday for regulating shared bikes in the city, according to the official micro-blog of Beijing Municipal Commission of Transport.

The city has registered nine bike sharing companies and more than 1.9 million shared bikes as of the end of April. However, active bikes only account for less than 50 percent, according to April statistics.

The campaign is directed towards areas with a large number of bikes and electric bikes, such as major avenues, subway stations, scenic spots and business districts.

Bike sharing companies are required to recycle broken bikes and clear bikes that are parked against regulations.

In September 2018, Beijing authorities set a limit on the number of shared bikes in the capital as the industry continued to grow.

China's bike-sharing market has grown rapidly over the past few years as part of a booming digital economy.