MEWR has adopted the World Health Organisation (WHO) Air Quality Guidelines (AQG) for particulate matter (PM10), nitrogen dioxide (NO2), carbon monoxide (CO) and ozone (O3), and the WHO Interim Targets for fine particulate matter (PM2.5) and sulphur dioxide (SO2), as Singapore’s air quality targets for 2020. To attain these air quality targets by 2020, abatement measures are being implemented to reduce emissions from vehicles and industries.