• geniune question: where is the data saying "its the main source of pollution in London right now"?

    The are referring to a very specific type of pollution, PM2.5 or whatever. It's likely that other stuff is responsible for far greater volumes of stuff, but they are focussing on PM2.5.

  • Because PM2.5 is the most dangerous to human health.

    (ignoring knock-on effects from climate change caused by other pollutants)

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