By cycling instead of driving or taking public transport, you are doing your part to keep the air clean. The problem is that you have to cycle through all the pollution created by people who aren’t making any effort.

Pollution has been linked to heart and lung disease, and people often complain of other less serious reactions such as sore-throats, coughs and stinging eyes. I have often noticed that if I cycle a few miles in London in a white t shirt, it picks up lots of black particulates.

It’s impossible to quantify the pollution level for a city in any simple way, because the level of pollution varies from area to area, and…

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