Junwen’s new paper ‘Substantial Reductions in Black Carbon from both Fossil Fuels and Biomass Burning during China’s Clean Air Action‘ has been accepted for publication in PNAS. It is a great success in the application of our AMS facility and OC/EC radiocarbon measurement system. Professor Yu Jianzhen (郁建珍) of Hong Kong University of Science & Technology collected the  precious 12-year samples; Jiang Fan (姜帆) did most of the radiocarbon analysis in the AMS lab and contributed to the writings. Congratulations!