The BBC did a video a few weeks back showing that you're exposed to more pollution in a car: https://www.bbc.co.uk/news/av/uk-england-south-yorkshire-49960950/h

The BBC did a video a few weeks back showing that you're exposed to more pollution in a car: https://www.bbc.co.uk/news/av/uk-england-south-yorkshire-49960950/how-do-you-breathe-less-pollution-on-school-run https://www.bbc.co.uk/news/av/uk-england-south-yorkshire-499... Not sure how that translates to cancer risk but came as a surprise to me.