National Pollution Control Day is observed every year on December 2 in India to honour the thousands of victims who lost their lives in the Bhopal Gas Tragedy of December 2–3, 1984 — the world's worst industrial disaster. In 2025, the 41st anniversary was observed with the theme 'Sustainable Living for a Greener Future', calling for environmentally responsible habits at individual and governmental levels. The Bhopal disaster occurred when methyl isocyanate (MIC) gas leaked from Union Carbide India Limited's (UCIL) pesticide plant, killing an estimated 3,787 people officially (with some estimates exceeding 15,000 deaths and over 5 lakh people affected). The disaster prompted India to enact the Environment Protection Act, 1986 and strengthen the Central Pollution Control Board (CPCB) framework. In January 2025, India cleared the last remnants of toxic waste from the Bhopal plant site — 40 years after the catastrophe — marking a significant milestone in environmental remediation. The day is used to raise awareness about air, water, noise, and plastic pollution and to reinforce the need for stringent enforcement of pollution control norms under India's environmental laws.