PSI levels higher after including readings of fine particles

Singapore's air quality readings have been updated from Tuesday to include fine particles, so the Pollutant Standards Index (PSI) levels now looks higher than before.

Get the full story from The Straits Times.

Here is a statement from the National Environment Agency on April 1, 2014: 

With effect from 1 April 2014, Singapore will move to an integrated air quality reporting index, where PM2.5 will be incorporated into the current Pollutant Standards Index (PSI) as its sixth pollutant parameter.

The PSI will therefore reflect a total of six pollutants - sulphur dioxide (SO2), particulate matter (PM10) and fine particulate matter (PM2.5), nitrogen dioxide (NO2), carbon monoxide (CO) and ozone (O3).

The 3-hour PSI will take into account PM2.5 concentrations. In addition, NEA will also publish the 1-hour PM2.5 concentrations every hour.

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