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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Rather cloudy but mainly dry with some brightness tomorrow.
Frost free tonight then mainly dry and bright tomorrow.
Sutty from the Pets as Therapy charity is one popular visitor on the Children's wards, helping brighten up the day for poorly patients.