Special Delivery <a href=" http://www.welaunch.co.uk/allopurinol-uk.pdf ">allopurinol online uk</a> "The air most people breathe has become polluted with a complicated mixture of cancer-causing substances," said Kurt Straif, head of the IARC department that evaluates carcinogens. He said the agency now considers pollution to be "the most important environmental carcinogen," ahead of second-hand cigarette and cigar smoke.