Why was the great stink dangerous

The great stink was dangerous due to its impact on London, thought to transmit the Cholera outbreak at that time.

Explanation:

The Great Stink was caused by humans, as at the time, feces was drained into the Thames. However, due to a hot summer in 1858, the feces smelt even worse. To add to the problems, the Thames river got polluted because of this unreliable sewer system.