With courtesy of De Cort et al. (1998): "Atlas of Caesium Deposition on Europe after the Chernobyl Accident", EUR report nr. 16733, EC, Office for Official Publications of the European Communities, Luxembourg
Keep your dog on a lead if it is likely to run off and disturb wildlife.
In particular, be careful of nesting birds in early spring and early summer, and roosting or feeding birds in winter. If you have a dog, keep this in mind when you're taking it for a walk!
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