The map above simulates a 300-kiloton nuclear airburst over Mumbai, India — roughly the size of a modern deployed warhead. The coloured rings show the estimated fireball, the zones of heavy, moderate and light blast damage, the reach of the thermal flash and the ionizing-radiation dose. Drag the marker or change the weapon in the full simulator to explore other scenarios.
The metropolitan area is home to about 21.7 million people — the rings above are drawn to real scale over their homes.
The marker is in the middle of the island city, over Dadar and Mahim. The 1.9 km zone of total destruction covers Dadar station, Shivaji Park and Mahim; the 4.7 km collapse ring reaches Dharavi, Bandra's southern edge, Worli, Sion and the Bandra–Worli Sea Link. Third-degree burns extend to about 7.5 km over Bandra, Kurla, Parel's mill district and Byculla; the 14.5 km ring of broken windows covers Marine Drive and Churchgate in the south, Andheri and the airport in the north, and Chembur to the east.
Mumbai packs about 21 million people into a narrow peninsula; Dharavi, just inside the collapse ring, is one of the most crowded square kilometres on the planet. Water on both sides of the island absorbs part of the blast, but what remains falls on exceptionally dense housing. India's own warheads are believed to be smaller than this scenario, Pakistan's in the same range; see Nuclear arsenals.
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