As for high BC levels exceeding the average concentration (2.52 mgm−3) at Tongyu, the area between Jiangsu Province and Anhui Province of China and the boundary regions between China and Russian Primorskiy and Khabarovskiy became remarked possible source areas of fire emissions (Figure 8). In addition, these regions rose up their roles to disturb other higher BC levels in the atmosphere of Tongyu, e.g., at BC levels of 5.0 mgm
(Figure 9).