I can't provide a link but just google Oslo Effect. That is where I took my facts from.Perhaps you'd like to provide a link to any studies that confirm your assertion (though on past performance I'm not holding my breath). In the meantime forum members could try reading this short article: http://www.abc.net.au/science/articles/2012/07/31/3554997.htm as an introduction to the subject. While this article also provides no links to any studies it does appear reasonably trustworthy. In particular I note that it claims that tyre and brake wear cause only 3% to 7% of harmful particulate pollution attributable to road transport. If true that suggests that while the issue is certainly worthy of further research the most pressing issue arising from road vehicle pollution is indeed exhaust emissions. It also says the quantity of such materials produced annually in Europe is just 40,000 tonnes; what does the number of 440,000 tons refer to?
Yes 440.000 should read 44,000 tons annually. Thank you for pointing that out. Still a sizeable amount and accounts for up to 50.000 premature deaths in the UK annually.
I was also wrong stating only 23% of particulate matter comes from exhaust emissions. It is only 10%. 90% comes from tyre and brake wear which you do not get with rail vehicles.
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