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Wang, Z., Qian, Y., Li, Z., Wu, K., Guo, C., Zhang, L., LI, X., Guo, J., Q, L. X., & L, Z. (2021). Analysis of regional heavy PM2.5 pollution events in Beijing-Tianjin-Hebei and the surrounding area in China during 2015–2018. Global NEST Journal, 23(3), 475-482. https://doi.org/10.30955/gnj.003589