However, because the straw Jinshao special work in late October 2017, propelled by strong Changchun, biomass burning contribution of PAHs in the atmosphere is relatively small.
However, the contribution of biomass combustion to PAHs in the atmosphere is relatively small due to the strong push of the straw burning project in late October 2017 by Changchun City.
However, the contribution of biomass combustion to PAHs in the atmosphere is relatively small because the special work of straw burning prohibition was strongly promoted by Changchun City in late October 2017