The Deposit Return Scheme for plastic bottles is leading to lower litter across the country.
Today's IBAL survey also shows Naas is the cleanest town in the country, ahead of Monaghan and Blanchardstown in Dublin.
Arklow is ranked 16th in the list of 40 towns and cities nationwide and is deemed clean to European norms.
However, Dublin city centre has seen a further deterioration and has been declared "Littered".
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