An is a municipality designated by the Japanese government to be a model for making large cuts in greenhouse gas emissions towards the realization of a low-carbon society.

Current environmental model cities Obihiro, Hokkaido Shimokawa, Hokkaido Yokohama, Kanagawa Prefecture Toyama, Toyama Prefecture Kitakyushu, Fukuoka Prefecture Minamata, Kumamoto Prefecture The above municipalities were designated on July 22, 2008. Chiyoda, Tokyo Prefecture Iida, Nagano Prefecture Toyota, Aichi Prefecture Kyoto, Kyoto Prefecture Sakai, Osaka Prefecture Yusuhara, Kōchi Prefecture Miyakojima, Okinawa Prefecture The above municipalities were designated on January 22, 2009.