Air Pollution Reaches High Levels Across London

LONDON, ENGLAND - APRIL 02: A man wearing an anti-pollution mask rides a bicycle at Hyde Park Corner on April 2, 2014 in London, England. Dust from the Sahara combined with pollution from mainland Europe has contributed to one of the worst smogs of the year this week with record levels being recorded in parts of England on Tuesday. The BBC weather centre predicts a potential 8 or 9 out of 10 level of air pollution likely to be found in East Anglia and the East Midlands later today. (Photo by Rob Stothard/Getty Images)