Singapore Fine Particles (PM 2.5)

PSI PM2.5 Effects
0–50 0–12 Good


51–100 12-35 Moderate

Few or none for the general population

101–200 35-150 Unhealthy

Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects. To stay indoors.

201-300 150-250 Very unhealthy

Health warnings of emergency conditions. The entire population is more likely to be affected.

301+ 250-500 Hazardous

Health alert: everyone may experience more serious health effects