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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 22 Sep 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 72 74 76 77 79 82 85 87 90 91 92 92
South 71 73 75 76 77 78 80 81 81 82 83 84
East 74 76 77 79 80 82 84 86 87 87 88 88
West 68 70 72 73 75 77 80 83 85 86 87 87
Central 72 74 76 78 80 81 84 86 88 88 89 89
Overall Singapore 68-74 70-76 72-77 73-79 75-80 77-82 80-85 81-87 81-90 82-91 83-92 84-92
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 92 91 91 91 91 91 89 85 - - - -
South 85 85 85 85 85 84 81 76 - - - -
East 89 89 89 89 89 87 84 79 - - - -
West 87 88 87 87 87 87 86 84 - - - -
Central 89 89 88 88 88 87 85 81 - - - -
Overall Singapore 85-92 85-91 85-91 85-91 85-91 84-91 81-89 76-85 - - - -

3-hr PSI Readings from 1am to 12am on 22 Sep 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 92 94 94 92 92 93 99 103 101 85 71 62
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 63 64 63 63 63 64 64 62 - - - -

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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