Many of us don't give much thought to the air that we breathe, but scientists from the University of Leicester are doing just that to learn how pollution affects us.
In a world-first experiment they've mapped the whole of the city by plane, to see how fumes and emissions are carried around. They hope the work will mean we can lead cleaner, healthier lives. Chris Halpin reports.
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A largely cloudy but mostly dry start.
A cloudy or misty start to the weekend, although mainly dry with sunny spells developing. Low cloud may linger in some spots.
A largely cloudy start to the weekend but mostly dry start. Through the day, some sunny spells are likely to develop.