Guardian: Every so often a statistic emerges to send shockwaves through the most innumerate skulls. One such figure, highlighted by the Royal College of Physicians in a report on Tuesday, is the annual toll of 40,000 premature deaths attributable to outdoor air pollution. It implies that the finger can be pointed at unclean air for about 8% of all of the half million or so deaths recorded in the UK every year, a far higher proportion than is usually blamed on alcohol or obesity, two public health problems...