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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Mostly dry overnight with clear spells, although one or two showers are possible.
Dry with some late sunny spells developing during the evening.
The major annual Sikh parade started at the Guru Nanak Gudwara and continued through the city streets.