Read more about the selected contamination levels for Cs-137 and correlated intervention measures.
Also you can view results on a large domain or a zoomed domain. We recommend the zoomed domain where ever possible, as patterns in the large domain are smoothed due to the coarse resolution (approx. 100 km, but 10 km in the zoomed domain). Especially, DO NOT LOOK AT LARGE DOMAIN FOR HIGH VALUES (e.g. 1 yr effective dose > 250 mSv)