There has been a lot of very scary headlines recently about air pollution. This one for example. Once again some great research by Paul Homewood has put this into perspective - see this piece . Of course any pollution poses a risk, but nature itself produces much of it and there is no escape from it. Those who are ill and have no tolerance have to be very careful and use masks etc. For most of us here in the West are living in the most unpolluted air in the past hundred years or more with levels of pollutants so low that they would have been undetectable just a few decades ago. Further reduction in human-caused pollution will have to be balanced against the cost to us all in the availability of affordable personal transport.
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