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.
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.