Scientists fly high to tackle rising air pollution levels

Scientists have taken to the skies as part the most comprehensive ever assessment of Britain's air pollution. Researchers from the Natural Centre for Atmospheric Science are flying through the plume of pollution billowing from major cities to calculate exactly how many tonnes of sooty particulates and toxic gases are being emitted. Sky News joined them for the first flight in a specially adapted aircraft to measure pollutants in a cross-section of the plume blown downwind of Manchester and Liver