Historical PSI Reading

Prior to 24 Aug 2012, 24-hr PSI was reported once a day at 4pm. On 24 Aug 2012, NEA increased 24-hr PSI reporting frequency to three times a day (i.e. 8am, 12noon and 4pm). Since 20 Jun 2013, 8pm, hourly 24-hr PSI reporting was implemented.

From 1 Apr 2014, PM2.5 data is subsumed into PSI. Hourly updates on 24-hr PSI levels will be reported.

View regional PSI and PM2.5 Readings for:

Time
24-hr PSI
North
South
East
West
Central
Overall Singapore
1am
61
58
58
61
56
56-61
2am
61
58
58
61
56
56-61
3am
60
58
58
61
56
56-61
4am
60
58
57
61
56
56-61
5am
-
-
-
-
-
-
6am
-
-
-
-
-
-
7am
-
-
-
-
-
-
8am
-
-
-
-
-
-
9am
-
-
-
-
-
-
10am
-
-
-
-
-
-
11am
-
-
-
-
-
-
12pm
-
-
-
-
-
-
1pm
-
-
-
-
-
-
2pm
-
-
-
-
-
-
3pm
-
-
-
-
-
-
4pm
-
-
-
-
-
-
5pm
-
-
-
-
-
-
6pm
-
-
-
-
-
-
7pm
-
-
-
-
-
-
8pm
-
-
-
-
-
-
9pm
-
-
-
-
-
-
10pm
-
-
-
-
-
-
11pm
-
-
-
-
-
-
12am
-
-
-
-
-
-