Tokyo Gov. Yuriko Koike announced Wednesday the adoption of the Tokyo Declaration, in which 22 megacities around the world committed to reducing waste and tackling air pollution by sharing technologies and knowledge.

The announcement came during the Tokyo Forum for Clean City and Clear Sky, a two-day symposium hosted by the Tokyo Metropolitan Government in Shinjuku Ward.

During the event, governors and officials from global cities such as Tokyo and Yokohama, as well as, Hanoi, Hong Kong, Paris, Singapore, Sydney, Ulaanbaatar, Yangon and Durban, South Africa and Tomsk, Russia — exchanged information on recycling and waste management programs that had been implemented to address environmental issues.