World Environmental Health Day is annually observed in many countries around the world on September 26. The observance was inaugurated in 2011 in Indonesia. World Environmental Health Day was launched by the IFEH Council (International Federation of Environmental Health). This organization disseminates knowledge about environmental health among people and promotes cooperation between countries to improve the environmental situation on our planet.

In 2011, the IFEH Council launched the first observation of WEHD in Indonesia. To that occasion, Indonesian students-activists composed a special hymn and performed it to celebrate the launch of this event. Already in 2012, the event was observed in Africa and Europe, and in 2013, it was supported by Canadian, British, American, Australian, and Asian activists.