Challenge has finished
Images of examples of pollution.
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Friday, 14th March, 2014 (GMT)
Friday, 21st March, 2014 – Thursday, 27th March, 2014 (GMT)
Friday, 28th March, 2014 – Thursday, 3rd April, 2014 (GMT)
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Maximum number of entries per user:
Maximum number of entries in challenge:
These entries were provided by the challenge host(s) as samples and cannot be voted on. Upload sample image.
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