The map above simulates a 300-kiloton nuclear airburst over Toronto, Canada — 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 6.4 million people — the rings above are drawn to real scale over their homes.
The marker is on City Hall and Nathan Phillips Square. The 1.9 km zone of total destruction covers the Financial District, Union Station, the Eaton Centre, the CN Tower and Queen's Park's southern end; the 4.7 km collapse ring reaches Kensington Market, the University of Toronto, the Distillery District, Liberty Village and the Toronto Islands' northern shore. Third-degree burns extend to about 7.5 km over Cabbagetown, Little Italy, Parkdale, Rosedale and the Port Lands; the 14.5 km ring of broken windows reaches the Beaches, the Danforth, High Park, St. Clair West and the Don Valley.
The Greater Toronto Area has about 6.5 million people and the downtown core is dense and high-rise, while the rest of the ring is mid-density residential. Lake Ontario to the south absorbs about a third of each circle. Canada helped build the first bomb through the Manhattan Project's Montreal laboratory but has never had nuclear weapons of its own. See Nuclear arsenals.
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