The poster competition was open to children aged 5-11, and three winners will each receive publicity for their artistic talents and a £20 book token.
Entries were submitted to judge, Tim Smedley, Banbury-based author of 'Clearing the Air: the Beginning and the End of Air Pollution.'
Tim said, "There were some really creative and colourful ideas, so congratulations to everyone who made a Clean Air Day poster. The messages about what we need to do are so clear - walking and cycling are the best way to travel for clean air."
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The winners of the contest are Gracie Freeman aged 9 and Wiktona Plantier aged 6, both from St Leonard's Primary School. Elira Vladi aged 9 from Queensway Primary School also placed in the top three.
Extinction Rebellion Banbury members also highlighted traffic pollution on Hennef Way, one of the most polluted roads in the county. The group's Facebook page invited readers to make pledges to reduce their impact on pollution, which included taking the bus into town rather than driving, combining several short journeys into one and turning off car engines instead of idling.
Find out more about Clean Air Day at www.cleanairday.org.uk and more about the local XR group on Facebook, Extinction Rebellion Banbury.