Unprecedented shifts in aerosol pollution sources in China under a decade of clean air actions

Unprecedented shifts in aerosol pollution sources in China under a decade of clean air actions

China is a major hotspot of black carbon (BC) emissions, contributing to climate warming and risk to public health. Here, our dual-isotope-constrained observations indicate stringent air pollution controls have drastically reduced coal-burning in North China over the past decade, marking a transition to a “post-coal” era compared to earlier 2012–2014. However, biomass-burning fraction (fbb) for north/central/east winter hazes has doubled from ea…