* computed on 24-hour average Particulate Matter (PM) 10 reading (µg/m3)

** computed on 24-hour average Particulate Matter (PM) 2.5 reading (µg/m3)

* computed based on 8-hour average Ozone reading (µg/m3)

** computed on 8-hour average Carbon Monoxide (CO) reading(mg/m3)

*** computed on 24-hour average Sulphur Dioxide (SO2) reading (µg/m3)