GgoogleSG first seen 1 d ago, last 23 h ago, peak #6
PM2.5 vs PSI: How Singapore and Indonesia read haze differently
Original: pm2.5 vs psi air measurement
Attention is on the difference between PM2.5 and PSI as air quality measures, a long-running point of confusion each time haze from Indonesian forest fires reaches Singapore. PM2.5 tracks fine particles most harmful to health, while PSI combines several pollutants into one index. The debate has resurfaced after an Indonesian official said the fires were 'beyond human error' and claimed the country's forests 'send oxygen' when there is no haze, remarks that drew sharp reactions.
Why now: Haze season has revived debate over which air quality measure better reflects health risk, alongside provocative comments from an Indonesian official.
Evidence
- Haze Situation Update (11 October 2026) · NEA.gov.sg
- Indonesian govt official says forest fires 'beyond human error' & their forests 'send oxygen' if there's no haze · Mothership
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