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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 24 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 45 45 46 46 44 44 43 44 45 46 47 46
South 51 51 52 52 51 51 49 50 51 52 54 54
East 48 48 49 51 51 52 52 51 51 52 52 52
West 41 40 38 37 38 39 39 40 43 45 46 46
Central 46 45 44 44 43 42 41 40 40 41 42 43
Overall Singapore 41-51 40-51 38-52 37-52 38-51 39-52 39-52 40-51 40-51 41-52 42-54 43-54
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 47 49 - - - - - - - - - -
South 55 55 - - - - - - - - - -
East 52 53 - - - - - - - - - -
West 45 45 - - - - - - - - - -
Central 44 44 - - - - - - - - - -
Overall Singapore 44-55 44-55 - - - - - - - - - -

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

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 54 55 53 52 51 51 39 38 43 54 58 59
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 57 56 - - - - - - - - - -

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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