CHECK BOTH PSI AND PM2.5 READINGS
Ms Fu urged people to check both the 24-hour PSI and 1-hour PM2.5 readings when planning outdoor activities, as the two indicators serve different purposes.
The 24-hour PSI provides a picture of air quality over a longer period and is useful for assessing sustained exposure, while the 1-hour PM2.5 reading reflects more immediate conditions, which can change quickly.
A low 24-hour PSI reading coupled with a high one-hour PM2.5 reading could indicate that air quality has recently worsened, even though the longer-term average has yet to rise, she explained.
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