An interesting point, but further study indicates that the research quotes is pretty rubbish.
For instance, other news reports on it indicate that the Oxford measurement was taken on Queen Street, which is where all the busses wait. It's not surprising that the pollution level is rather high.
Also, they are only measuring oxides of nitrogen, which is only one of the pollutants from cigarettes. Of course internal combustion engines produce other pollutants too, but it isn't an apples to apples comparison.
Also, other research I've found on the web seems to suggest that cigarettes typically have 100-600 microgrammes of nitrogen oxide per cigarette, which is somewhat larger than the value of 29 used in the study. Thus, this will change the comparison quite considerably.
Having descended the hill from Headington to Cowley Road, and felt my eyes start streaming and stinging as I enter the pollution cloud, I have to agree that there is certainly no shortage of pollution in Oxford. It's certainly not as bad on a train/tube into London. Although Maybe it's 'cos I've acclimatised.
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For instance, other news reports on it indicate that the Oxford measurement was taken on Queen Street, which is where all the busses wait. It's not surprising that the pollution level is rather high.
Also, they are only measuring oxides of nitrogen, which is only one of the pollutants from cigarettes. Of course internal combustion engines produce other pollutants too, but it isn't an apples to apples comparison.
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