Bhopal Gas Leak Kills Thousands in India

Context

In the decades after independence, India encouraged foreign investment to build its industrial base, including pesticide manufacturing to support agriculture. Union Carbide Corporation, an American chemical company, established a subsidiary, Union Carbide India Limited, which opened a formulation plant in Bhopal in 1969. By the late 1970s the facility produced the pesticide Sevin on site, requiring large-scale storage of the intermediate chemical methyl isocyanate, or MIC, a highly reactive and toxic substance.

What Happened

On the evening of December 2, 1984, workers at the Bhopal plant noticed rising pressure in a storage tank containing roughly 40 tons of MIC. Water had entered the tank, likely during efforts to clear a clogged pipe, triggering an exothermic reaction that rapidly generated heat and gas. Multiple safety systems—including a vent-gas scrubber, flare tower, and refrigeration unit—were either shut down for maintenance or otherwise inoperable.

Aftermath

By early morning on December 3 the gas had spread across densely populated slums surrounding the plant, awakening residents with burning eyes, choking, and panic. Hospitals were quickly overwhelmed as thousands arrived suffering respiratory distress. Plant manager and several employees were arrested by local authorities, and Union Carbide chairman Warren Anderson was detained briefly upon arriving in Bhopal.

Legacy

The Bhopal disaster remains the deadliest industrial accident in history and prompted widespread examination of safety standards at multinational chemical facilities operating in developing countries. It contributed to the adoption of stricter regulations on hazardous materials and greater emphasis on corporate responsibility for overseas operations, while affected communities continue to contend with long-term health effects and environmental contamination.