http://www.theguardian.com/environment/bike-blog/2014/feb/20/air-pollution-cyclists-bike-blog
Having read those papers I wouldn’t say they have no benefit. I might say that people who wear them probably overestimate the benefits that they’re delivering, but I think there’s enough in that paper to say they make some difference.
@dan started
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http://www.theguardian.com/environment/bike-blog/2014/feb/20/air-pollution-cyclists-bike-blog