Singapore has not yet moved to replace the PSI with the Air Quality Index. Instead, it publishes the PSI and the PM2.5 Concentration separately. Although PSI is derived by averaging data collected for the past 24 hours, Singapore publishes its PSI based on data from the past 3 hours instead. This 3-hour PSI is unique to Singapore and was introduced in 1997 to provide additional air quality information which would better reflect a more current air quality situation.[1] The highest 3-hour PSI reading on record in Singapore is 321 on 19 June 2013 at 10 pm (GMT +8).[1] This reading was released 57 minutes late at 10:57pm.
Posted on: Thu, 20 Jun 2013 04:00:05 +0000
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