National Environment Agency Our Environment
print Home Anti-Pollution & Radiation Protection Air Pollution Control PSI PSI Readings over the last 24 Hours

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 Aug 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 56 55 55 55 55 55 55 56 57 58 59 58
South 52 52 52 52 52 52 53 53 54 54 55 55
East 52 52 52 52 52 52 52 53 53 54 54 54
West 52 51 51 51 51 52 53 53 54 55 55 54
Central 53 53 53 53 53 53 53 54 54 55 56 56
Overall Singapore 52-56 51-55 51-55 51-55 51-55 52-55 52-55 53-56 53-57 54-58 54-59 54-58
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 57 57 56 56 55 55 54 - - - - -
South 55 54 54 53 52 52 52 - - - - -
East 54 53 53 53 52 52 52 - - - - -
West 54 53 53 53 52 52 52 - - - - -
Central 55 55 54 54 53 52 52 - - - - -
Overall Singapore 54-57 53-57 53-56 53-56 52-55 52-55 52-54 - - - - -

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

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 52 53 55 55 55 55 56 57 58 59 62 60
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 53 29 17 21 33 40 47 - - - - -

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.

image description