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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 22 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 52 53 53 54 54 55 56 56 57 57 57 57
South 40 41 41 41 43 46 47 47 48 48 49 49
East 43 39 38 38 38 40 42 44 45 47 46 45
West 52 52 52 53 53 54 54 55 55 55 56 56
Central 40 39 38 38 40 42 42 43 44 45 46 46
Overall Singapore 40-52 39-53 38-53 38-54 38-54 40-55 42-56 43-56 44-57 45-57 46-57 45-57
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 22 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 46 48 51 51 52 56 57 56 55 54 55 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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