1. Environment Research Institute, Shandong University, Qingdao 266237, China
2. Department of Chemistry, North-Eastern Hill University, Shillong 793 022, India
3. State Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing 100081, China
4. Department of Chemistry, Faculty of Science, The University of Bamenda, P.O. Box 39 Bambili-Bamenda 00000, Cameroon
5. Research Unit of Noxious Chemistry and Environmental Engineering, Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67 Dschang 00000, Cameroon