World Environmental Health Day
World Environmental Health Day is held on September 26. This event in the third decade of the month September is annual. 
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Similar holidays and events
World Rivers Day on September 25 (last Sunday of September);
World Dream Day on September 25
World Pharmacist Day on September 25
Bladder Cancer Awareness Walk in Canada on September 25
World’s Largest Pet Walk on September 25 (held since 2018);
World Environmental Health Day on September 26
National Gay Men's HIV/AIDS Awareness Day on September 27 (United States);
National Day of the Deaf in El Salvador on September 27 (Día Nacional de la Persona Sorda)