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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 24 Apr 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 61 61 60 58 57 57 56 56 55 54 53 53
South 61 61 60 59 58 57 56 56 55 54 53 53
East 59 58 58 57 56 54 53 52 52 48 47 46
West 61 61 61 61 61 60 60 59 58 57 57 56
Central 60 59 59 58 57 56 56 55 55 54 54 54
Overall Singapore 59-61 58-61 58-61 57-61 56-61 54-60 53-60 52-59 52-58 48-57 47-57 46-56
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 53 52 52 52 52 53 53 - - - - -
South 52 51 49 48 48 49 52 - - - - -
East 44 41 41 40 41 43 47 - - - - -
West 56 55 55 55 54 54 55 - - - - -
Central 53 53 52 52 52 53 54 - - - - -
Overall Singapore 44-56 41-55 41-55 40-55 41-54 43-54 47-55 - - - - -

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

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 51 49 43 33 32 33 38 42 49 51 51 51
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 52 52 55 58 62 63 64 - - - - -

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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