Cardiff Council is launching its 'Usual Suspects' litter campaign.
It aims to reduce the amount of litter in the city and ensure that the streets of the capital are kept clean.
It costs taxpayers around £7m a year to keep the city clean with cigarette butts, chewing gum and dog mess often on streets.
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Veteran singer Sir Tom, 75, is gearing up for his first concerts since wife Linda died after a "fierce" battle with cancer in April.
It will be a dry and fine day across the country with plenty of warm sunshine and light winds.