Dates designated for the promotion of environmental issues.
- World Wetlands Day - February 2
- UN World Day for Water - March 22
- UN World Meteorological Day - March 23
- Earth Day - April 22
- Arbor Day - Last Friday in April
- International Migratory Bird Day - May 3
- International Day for Biological Diversity (World Biodiversity Day) - May 22
- Bike-to-Work Week - Third Friday in May
- Ozone Action Day - at certain times during the summer months
- Clean Air Day (Canada) - June 4
- UN World Environment Day - June 5
- Pollution Probe Clean Air Commute Week - June 23 to 27
- UN World Day to Combat Desertification and Drought - June 17
- UN World Population Day - July 11
- International Day for the Preservation of the Ozone Layer - September 16
- UN World Habitat Day - first Monday in October
- International Day for Natural Disaster Reduction - second Wednesday in October
- International Day for Preventing the Exploitation of the Environment in War and Armed Conflict - November 6
- International Mountain Day - December 11