Haze in Singapore: Get the latest PSI and PM2.5 readings
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While Indonesian farmers burn huge swathes of forest and peatland yet again, creating a blanket of smoke that clouds the skies over large parts of the region, people in Singapore have been putting up with the air pollution.
ST PHOTO: KELVIN CHNG
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SINGAPORE - Get the latest readings on air quality - updated every hour - with ST's haze widget.
The 24-hour PSI is based on readings taken over the past 24 hours.
The health advisory in Singapore is based on the 24-hour PSI. This is in line with the vast majority of studies on the health effects of short-term exposure to PM which have used the 24-hour measurements.
The 1-hour PM2.5 concentration readings are only an indicative measure of the current air quality. There are currently few studies on the health effects of short-term exposure to PM concentration levels.
There are four bands on the PM2.5 concentration scale: 0 to 55 for normal, 56 to 150 for elevated, 151 to 250 for high, and very high for any higher readings.
A 24-hour PSI reading of between 51 and 100 falls in the moderate range, for which the public can continue their normal activities.
If the PSI reading is in the unhealthy range of 101 to 200, NEA advises the public to cut down on prolonged or strenuous outdoor activities.
NEA added that the PM2.5 concentration readings are a better indicator of current air quality.
Those concerned should use PM2.5 readings to decide on whether to go for immediate outdoor activities, such as a jog.
The PM2.5 concentration levels can be volatile and tend to fluctuate over the day especially during periods of transboundary haze.
Short-term fluctuations are greatly influenced by weather conditions.
