As Delhi's air turns toxic once again, blanketed by winter smog that makes breathing difficult, the city faces a crisis that many major global metropolises have already overcome. Cities like London, Beijing, and Los Angeles were once choking on pollution—suffering from severe illness, reduced visibility, and escalating death tolls. Their success, achieved through stringent legislation, technological innovation, and public participation, offers critical lessons for India's capital.

Here is a look at how these five cities cleaned up their act:

1. London: Freedom From Coal Fumes

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In the 1950s, London was overwhelmed by the "Great Smog." The cold weather combined with smoke from burning coal in homes and factories created a dense, lethal haze that cut visi

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