New PSI reporting system kicks in

The Pollutant Standards Index (PSI) readings may look slightly worse than usual from Tuesday, even if air quality remains the same. The updated PSI reporting system kicked in on Tuesday.

SINGAPORE: The Pollutant Standards Index (PSI) readings may look slightly worse than usual from Tuesday, even if air quality remains the same.

The updated PSI reporting system kicked in on Tuesday.

The National Environment Agency said it aims to give people a more accurate picture of air quality, so that they are better able to respond.

As part of the change, the agency will publish the concentration of fine particulates in the air every hour.

These particulates, called PM2.5, will also be factored into the existing three-hour average index.

PM2.5 has also been added as a sixth pollutant in the 24-hour reporting system.

NEA said this would bring the overall PSI number up, even though the actual concentration of pollutants is unchanged.

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