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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 01 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 67 68 69 69 70 70 70 69 69 70 70 69
South 71 70 71 71 71 71 71 70 69 68 69 68
East 66 66 66 66 66 66 66 65 65 65 65 66
West 66 66 66 65 65 64 64 63 62 62 62 62
Central 65 65 65 65 65 65 65 65 65 65 65 66
Overall Singapore 65-71 65-70 65-71 65-71 65-71 64-71 64-71 63-70 62-69 62-70 62-70 62-69
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 69 69 69 68 69 - - - - - - -
South 67 67 66 66 66 - - - - - - -
East 66 66 65 65 64 - - - - - - -
West 62 62 63 63 63 - - - - - - -
Central 67 66 66 65 66 - - - - - - -
Overall Singapore 62-69 62-69 63-69 63-68 63-69 - - - - - - -

3-hr PSI Readings from 1am to 12am on 01 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 64 67 70 75 75 72 69 65 65 65 68 69
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 70 68 67 68 69 - - - - - - -

Hourly updates of 3-hr PSI readings are provided from 7am to 11pm. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.

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