Celebrated on the first Monday of every October, World Architecture Day was set up by the Union International des Architects (UIA) back in 2005 to “remind the world of its collective responsibility for the future of the human habitat”, coinciding with UN-Habitat's World Habitat Day.
This year both organizations have defined themes related to improving the quality of life and reducing the effects of the climate crisis by taking action in the built environment. While the International Union of Architects' 2021 World Architecture Day theme is "Clean Environment for a Healthy World", UN-Habitat's World Habitat Day has announced "Accelerating Urban Action for a Carbon-Free World" as their topic.