Sulphur dioxide (SO2) is one of the six pollutants that we track and monitor closely in Singapore, with the others being particulate matter (PM10), fine particulate matter (PM2.5), nitrogen dioxide, carbon monoxide and ozone. Sources of SO2 emissions in Singapore include industries such as refineries and power stations, as well as motor vehicles.
The 2015 SO2 emission inventory, developed based on extensive emissions data collected from various sources, is shown in the table below. While the companies operate within permissible limits and form part of the Chemical Cluster (comprising petroleum, petrochemicals and specialty chemicals sectors which contribute to more than a third of the total manufacturing output in Singapore), it is important to continue striving for improved emission targets. The industries are also working towards lower emission levels as part of the overall goal of achieving better air quality for Singapore over the long term.