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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 09 Dec 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 45 47 48 48 48 48 47 47 47 46 46 46
South 51 51 51 51 51 51 51 51 52 52 52 52
East 50 50 49 48 48 50 51 50 50 50 50 51
West 39 40 41 40 41 42 43 43 45 46 47 49
Central 36 37 37 37 38 37 37 38 39 41 41 41
Overall Singapore 36-51 37-51 37-51 37-51 38-51 37-51 37-51 38-51 39-52 41-52 41-52 41-52
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North - - - - - - - - - - - -
South - - - - - - - - - - - -
East - - - - - - - - - - - -
West - - - - - - - - - - - -
Central - - - - - - - - - - - -
Overall Singapore - - - - - - - - - - - -

3-hr PSI Readings from 1am to 12am on 09 Dec 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 45 50 49 45 41 43 43 44 47 51 52 54
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI - - - - - - - - - - - -

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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