The 6th International Symposium on Regional Air Quality Management in Rapidly Developing Economic Regions and the 2nd Guangdong-Hong Kong-Macao Greater Bay Area Air Forum (6RAQM) was successfully held on 20-21 October 2020. The 2-day online conference attracted over 500 participants from Hong Kong, overseas and the Mainland China.  Fifty speakers from academia, governments, professional organizations, green organizations and industry have shared their inspirational insights on improving regional air quality management as well as the emerging issues and trends in the industry. If you are interested in knowing more, you can relive their talks on the event website now!