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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 21 Oct 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 80 80 79 78 77 76 76 74 74 74 74 74
South 78 78 77 77 76 75 74 73 72 72 71 70
East 79 79 79 78 78 77 75 73 71 70 69 69
West 94 95 95 94 93 92 91 89 87 86 85 84
Central 75 75 75 74 73 73 72 71 70 69 70 70
Overall Singapore 75-94 75-95 75-95 74-94 73-93 73-92 72-91 71-89 70-87 69-86 69-85 69-84
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 72 70 70 70 71 70 69 - - - - -
South 68 69 69 69 70 72 72 - - - - -
East 68 68 68 68 68 69 69 - - - - -
West 82 81 81 81 82 81 80 - - - - -
Central 68 68 68 68 69 69 68 - - - - -
Overall Singapore 68-82 68-81 68-81 68-81 68-82 69-81 68-80 - - - - -

3-hr PSI Readings from 1am to 12am on 21 Oct 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 66 68 68 67 67 70 76 80 83 84 87 84
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 74 66 65 72 77 79 73 - - - - -

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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