Friday, September 25, 2015

How do we interpret PM2.5 value?

The haze condition in Singapore worsens especially on yesterday when the Pollutant Standards Index (PSI) breached hazardous level. PSI is used and well known in Singapore as an air quality descriptor. Another important descriptor not to be over-sighted is the PM2.5 level which is a dominant pollutant during haze episodes. The smaller PM2.5 particles can pass through the smaller airways and travel deep into the lungs.

How do we interpret PM2.5 and at which level should we be cautious?

PM2.5 (µg/m3)PSI (Singapore)Health Concerns
0 - 120 - 50Good
12.1 - 35.451 - 80Moderate
35.5 - 55.481 - 100Unhealthy for sensitive groups
55.5 - 150.4101 - 200Unhealthy
150.5 - 250.4201 - 300Very unhealthy
250.5 - 350.4301 - 400Hazardous
350.5 - 500.4401 - 500Very hazardous

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