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PSI Readings over the last 24 Hours

Air quality readings will be available hourly from 1am to 12am.

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

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 54 55 55 54 54 54 54 54 54 54 55 55
South 51 51 51 51 51 51 51 51 51 51 52 52
East 53 53 53 53 53 53 53 53 53 53 53 53
West 55 55 54 54 54 54 54 54 54 55 56 56
Central 54 54 54 54 54 54 54 54 54 54 54 54
Overall Singapore 51-55 51-55 51-55 51-54 51-54 51-54 51-54 51-54 51-54 51-55 52-56 52-56
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 55 55 55 55 - - - - - - - -
South 52 52 51 52 - - - - - - - -
East 53 53 53 53 - - - - - - - -
West 56 56 56 56 - - - - - - - -
Central 54 54 54 55 - - - - - - - -
Overall Singapore 52-56 52-56 51-56 52-56 - - - - - - - -

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

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 54 54 52 51 48 48 47 46 48 52 52 54
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 55 57 57 58 - - - - - - - -

Hourly updates of 3-hr PSI readings are provided from 1am to 12am. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.

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