The Bhopal disaster was a gas leak at a Union Carbide pesticide plant in Bhopal, India in 1984. Over 500,000 people were exposed to toxic gases, and official death estimates vary between 3,000-8,000 in the weeks following. Long term health effects for survivors included eye issues like cataracts, respiratory problems like pulmonary fibrosis, and neurological and psychological impacts. It was one of the worst industrial disasters in history and had major environmental and economic impacts requiring extensive rehabilitation efforts.