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PSI Readings over the last 24 Hours

Air quality readings will be available hourly from 7am to 11pm. Air quality readings from 12am to 6am will be made available at 7am on the same day.

24-hr PSI Readings from 1am to 12am on 28 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 50 49 49 51 51 52 52 51 51 51 51 51
South 53 54 53 53 53 53 52 52 52 51 50 51
East 53 52 52 52 51 51 50 48 47 45 43 40
West 52 52 52 52 52 52 52 52 52 51 51 50
Central 48 49 48 48 48 49 49 48 48 47 48 48
Overall Singapore 48-53 49-54 48-53 48-53 48-53 49-53 49-52 48-52 47-52 45-51 43-51 40-51
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 52 52 52 52 52 52 52 - - - - -
South 49 49 49 47 48 51 51 - - - - -
East 40 40 40 39 41 41 42 - - - - -
West 50 52 52 52 51 52 52 - - - - -
Central 49 50 50 51 51 52 52 - - - - -
Overall Singapore 40-52 40-52 40-52 39-52 41-52 41-52 42-52 - - - - -

3-hr PSI Readings from 1am to 12am on 28 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 52 51 49 51 52 52 51 49 50 52 53 52
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 53 54 53 49 37 40 45 - - - - -

Hourly updates of 3-hr PSI readings are provided from 7am to 11pm. The 3-hr PSI readings from 12am to 6am will be made available at 7am on the same day. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.

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