Primary and secondary wastewater treatment processes are essential for removing pollutants, ensuring environmental stability ...

which are "key indoor pollutants and precursors for the formation of secondary pollutants, including aerosols and ozone." Exposure to any of these indoor pollutants could induce serious health ...

Environmentalist Angus Wong Chun-yin, of World Green Organisation, said: “As ozone is a secondary pollutant, it would require efforts to lower the emissions of NOx and VOCs in order to control ...