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Tougher clean air targets needed, experts say

22 January 2014 Last updated at 09:18 GMT

A study confirming a link between atmospheric pollution and heart attack risk strengthens the EU case for tougher clean air targets, according to experts.

Research in the BMJ looking at long-term data for 100,000 people in five European countries found evidence of harm, even at permitted concentrations.

Dominic Hughes reports.