PSI

PSI (With effect from 1 April 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-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

55
North
51
West
46
Central
47
East
47
South

Note: Air quality based on 24-hr PSI is as follows:

PSI Value Air Quality Descriptor
0 - 50 Good
51 - 100 Moderate
101 - 200 Unhealthy
201 - 300 Very unhealthy
Above 300 Hazardous

Health Advisory for General Public

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.

24-hr PSI

Healthy persons

Elderly, pregnant women, children

Persons with chronic lung disease, heart disease

≤100
(Good/Moderate)

Normal activities

Normal activities

Normal activities

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)

 

Avoid^^^ prolonged** or strenuous*** outdoor physical exertion

Minimise^^ outdoor activity

Avoid^^^ outdoor activity

>300
(Hazardous)

 

Minimise^^ outdoor activity

Avoid^^^ 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

Resources

No.

Title

 Resources

 Published Date 
 1
Poster: The 1-2-3 of PSI 

 
Please click here to view file
 September 2015
 2 Video: Tips to protect against the haze  
Please click here to view the video
 September 2015

 3

Infographic: Handy Guide on PSI

 
Please click here to view file

 April 2014

 4

Infographic: Summary of Changes to PSI (Infographic #1) 

 Please click here to view file

 April 2014

 5

Infographic: Understanding the PSI (Infographic #2) 

 Please click here to view file

 April 2014

 

Other useful links