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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-hr PSI will take into account PM2.5 concentrations. In addition, NEA will also publish the 1-hr PM2.5 concentrations every hour.
For past 24 hour PSI reading click here. For historical PSI reading click here.
24-hr PSI: 46 - 55; 3-hr PSI: 55
at 11am on 30 Jul 2016
Note: Air quality based on 24-hr PSI is as follows:
The health impact of haze is dependent on one's health status (e.g. whether one has pre-existing chronic heart or lung disease), the PSI (Pollutant Standards Index) level, and the duration and intensity of outdoor activity. Reducing outdoor activities and physical exertion can help limit the ill effects from haze exposure. Persons who are not feeling well, especially the elderly and children, and those with chronic heart or lung conditions, should seek medical attention.
Elderly, pregnant women, children
Persons with chronic lung disease, heart disease
101 - 200 (Unhealthy)
Reduce^ prolonged** or strenuous*** outdoor physical exertion
Minimise^^ prolonged** or strenuous*** outdoor physical exertion
Avoid^^^ prolonged** or strenuous*** outdoor physical exertion
201 - 300 (Very Unhealthy)
Minimise^^ outdoor activity
Avoid^^^ outdoor activity
** Prolonged = continuous exposure for several hours
*** Strenuous = involving a lot of energy or effort
^ Reduce = do less
^^ Minimise = do as little as possible
^^^ Avoid = do not do
Infographic: Handy Guide on PSI
Infographic: Summary of Changes to PSI (Infographic #1)
Please click here to view file
Infographic: Understanding the PSI (Infographic #2)
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Last Updated on 29 May 2014
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