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From early April 2020, wildfires raged in the highly contaminated areas around the Chernobyl nuclear power plant (CNPP), Ukraine. For about 4 weeks, the fires spread around and into the Chernobyl exclusion zone (CEZ) and came within a few kilometers of both the CNPP and radioactive waste storage facilities. Wildfires occurred on several occasions throughout the month of April. They were extinguished, but weather conditions and the spread of fires by airborne embers and smoldering fires led to new fires starting at different locations of the CEZ. The forest fires were only completely under control at the beginning of May, thanks to the tireless and incessant work of the firefighters and a period of sustained precipitation. In total, 0.7−1.2 TBq 137 Cs were released into the atmosphere. Smoke plumes partly spread south and west and contributed to the detection of airborne 137 Cs over the Ukrainian territory and as far away as Western Europe. The increase in airborne 137 Cs ranged from several hundred μBq•m −3 in northern Ukraine to trace levels of a few μBq•m −3 or even within the usual background level in other European countries. Dispersion modeling determined the plume arrival time and was helpful in the assessment of the possible increase in airborne 137 Cs concentrations in Europe. Detections of airborne 90 Sr (emission estimate 345−612 GBq) and Pu (up to 75 GBq, mostly 241 Pu) were reported from the CEZ. Americium-241 represented only 1.4% of the total source term corresponding to the studied anthropogenic radionuclides but would have contributed up to 80% of the inhalation dose.

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