Effectively controlling hazardous airborne elements: Insights from continuous hourly observations during the seasons with the most unfavorable meteorological conditions after the implementation of the APPCAP

• Xiaoyang YangChinese Research Academy of Environmental Sciences
• Shijie LiuChinese Research Academy of Environmental Sciences
• Peng Shao
• Jun Yong HeUniversity of Nottingham Ningbo China
• Ying Q. Liang
• Baojun Zhang
• Bin Liu
• Yu LiuLiaoning University
• Guiqian TangChinese Academy of Sciences
• Dongsheng JiChinese Academy of Sciences