Thai Environment Day Date in the current year: December 4, 2024

On December 4, 1989, King Bhumibol Adulyadej held a birthday ceremony at the Grand Palace. During the ceremony, he delivered a speech on the problems of Thai environment. Main environmental issues in Thailand include air pollution, deforestation, overfishing, field and forest burning, lack of water resources, water pollution, poaching, and wildlife habitat loss.

The King expressed concerned about the future of the country's environment and called on Thai citizens to cooperate in order to solve environmental issues. Two years later, the Ministry of Science, Technology and Environment designated December 4 as Thai Environment Day. Since 2002, the celebration has been coordinated by the Ministry of Natural Resources and Environment that was created that year.

Thai Environment Day focuses on raising awareness of environmental issues. On December 4, Thai citizens are encouraged to engage in eco-friendly activities, for example, plant a tree or ride a bike instead of using public transportation.