The numbers are in logarithmic scale of Becquerel per cubic meter. In the legend are the codenumbers of the CBTB measurement grid given. The slashed line corresponds to the historically highest measured value in Munich after the Chernobyl accident.
Also the norwegian NILU-ATMOS institute is forecasting release dispersals. You can choose the region and a animated forecast is computed for the next 3 days.
Why is using the cubic meter (m3) practical? It's about the amount of air surrounding us while we stand, sit or lay down.
