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70 years ago today, on December 5, 1952, the Great #Smog of #London began. Lasting for 4 days, it was an air #pollution event that resulted from a period of unusually cold and windless weather. Airborne pollutants from burning #coal collected over the city.

Contemporary medical reports estimated that 4,000 people died, and another 100,000 suffered some degree of illness. Modern estimates, however, put the #fatalities at 10-12,000.

The event resulted in the Clean Air Act 1956.