1. Department of Civil and Environmental Engineering; The Hong Kong Polytechnic University; Hong Kong
2. Environment Research Institute; Shandong University; Jinan China
3. NOAA Earth System Research Laboratory; Chemical Sciences Division; Boulder Colorado USA
4. Cooperative Institute for Research in Environmental Sciences; University of Colorado; Boulder Colorado USA
5. Department of Chemistry; University of California; Irvine California USA
6. Environmental Protection Department; Government of the Hong Kong Special Administrative Region; Hong Kong
7. PTC International Limited; Hong Kong
8. Department of Chemistry and Biochemistry; University of Colorado; Boulder Colorado USA