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Speed data: Just how polluted is London’s air?

On some measures, more polluted than anywhere else in the world—and it really is a killer

By Prospect Team   August 2017

Ozone flare

A dangerous gas where the trend is going the wrong way

A generation ago, Britain’s city-dwellers thought of local air pollution as a problem that was on the way to being licked—the smogs of the 1950s were fading from memory. But some forms of pollution have got worse since. Ozone doesn’t sound scary: it’s made out of oxygen, and occurs naturally, especially very high up, in the “layer” that shields us from the sun’s ultraviolet rays.

But this pungent gas is also created closer to the ground in reactions between…

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