Air pollution: How three global cities tackle the problem

India’s capital Delhi is blanketed under a hazardous shroud of air pollution.

City authorities have imposed a car rationing scheme in a bid to bring levels down, but experts believe the real blame lies with crop burning by farmers in neighbouring states.

Delhi is the latest city to try to come up with ways to tackle increasingly dangerous pollutants in the air.

This is what other cities have done in a bid to beat air pollution.

London

When was pollution at its worst?

Thick smog used to frequently blanket the UK capital in the 19th and 20th centuries, when people burned coal to warm homes and heavy industry in the city centre pumped chemicals into the air.

Referred to as “pea-soupers”, the most famous of these events was the so-called Great Smog of London in 1952. It was recently dramatised in the first series of the Netflix drama, The Crown.

Cold weather in the preceding days meant people had burned more coal — often of low quality, which released more sulphur dioxide — while inner-city coal power stations added to the….

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