Insights into particulate matter pollution in the North China Plain during wintertime: local contribution or regional transport?

Research summary

The study uses a source-tracing version of WRF-Chem to separate locally emitted pollution from material transported across the North China Plain during a winter haze episode. It finds that the balance between local and regional sources changes across locations and pollution conditions. The results support coordinated regional controls alongside local emission reductions, with different source patterns for primary and secondary particles.