Why is PSI trending in Singapore?
PSI is trending because air quality across Singapore has remained unhealthy since October 5. Recent readings show PM2.5 levels surging, particularly in the western region, due to regional haze caused by hotspots in Southeast Asia.
What happened
- 5 Oct
Singapore begins a stretch of unhealthy air quality with PSI readings exceeding 101 [2].
- 9 Oct
Authorities warn that air quality could reach very unhealthy levels if conditions persist [2].
- 14 Oct, 14:00 UTC
PM2.5 readings in western Singapore hit 284, entering the very high band [1].
What you need to know
The 24-hour PSI is currently unhealthy across all regions, ranging from 110 to 153 [1].
Healthy individuals should avoid strenuous outdoor activity, while vulnerable groups should minimize it [1].
N95 masks will be given to eligible vulnerable people if the 24-hour PSI goes above 200 [1].
Schools may close if the 24-hour PSI is forecast to exceed 300 [1].
It is not fully confirmed how severe the overall smoke haze situation is across some regions due to cloud cover [1].
Background
The Pollutant Standards Index (PSI) is the national system for reporting air quality, calculating levels based on six pollutants, including PM2.5 and PM10 [2]. PM2.5 particles are tiny pollutants that can enter the bloodstream and lodge deep in the lungs [2].
The current haze is linked to dry weather and hotspots in the southern ASEAN region, specifically in Kalimantan and southern Sumatra [1].
Experts note that standard home air-conditioners and indoor plants are generally ineffective at filtering out fine PM2.5 particles [2].
Questions people ask
Can air-conditioning remove haze particles?
Standard home filters catch large dust but not tiny haze particles; however, keeping windows closed while using air-con helps keep haze out [2].
What is the difference between PSI and PM2.5?
PSI is a 24-hour average of six different pollutants, while PM2.5 readings provide hourly data on specific fine particulate matter [2].
Where this came from
[1] channelnewsasia.com
PM2.5 readings high in 3 regions of Singapore as haze persists; air quality remains unhealthy across country
Preview image from channelnewsasia.com
[2] straitstimes.com
Can the air-con remove PM2.5 particles? Will indoor plants and surgical masks help?
Preview image from straitstimes.com
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