- World Environment Day is celebrated annually on June 5th, initiated by the United Nations Environment Programme (UNEP) in 1972. - Earth Day is celebrated annually on April 22nd since 1970, promoting environmental protection. - World No Tobacco Day is observed annually on May 31st, established by the World Health Organization (WHO) in 1987 to highlight the risks associated with tobacco use and advocate for effective policies to reduce consumption. - International Day for the Preservation of the Ozone Layer, also known as Ozone Day, is observed annually on September 16th, commemorating the signing of the Montreal Protocol in 1987.