Progress of the Cryptomeria japonica pollen front in 2016 (Fig. 1) was monitored by tracking the first day of pollen release using a Durham sampler at 84 sites, an IS-Rotary sampler at 8 sites distributed from Kyushu to Hokkaido. Results from the Durham sampler showed that, early in February, the pollen front had reached northern parts of Shikoku and southern parts of Kanto. In mid February, the front had progressed to the whole of Kyushu, southern to northern parts of Kanto and Tokai, almost the whole of Kinki, the whole of Chugoku except its middle parts and the whole of Hokuriku. In late February, the front had moved up to the southern and middle parts of Tohoku, the middle Chubu and Chugoku. By early March, the front was observed in the middle to northern parts of Tohoku. While middle in March, it came up to the north part of Tohoku district and the eastern parts of Hokkaido. The front finally arrived in the middle part of Hokkaido by late March.
