A deal signed with London this week to help tackle air pollution in Beijing is the latest in a string of moves to solve pollution problems through international cooperation.

Beijing Mayor Wang Anshun and his counterpart in London, Boris Johnson, signed a special memorandum of understanding between the two cities on Sunday, agreeing to exchange information on science, technology and environmental issues.

Shared areas of interest include greener electric bus fleets, energy efficiency programs and measures to improve air quality, according to a news release from the London government.