Air quality in eastern, western and central Singapore in unhealthy range
The Pollutant Standards Index in Singapore's eastern and western regions entered the unhealthy range at 4pm, after the central region crossed the threshold earlier, as hotspots and haze persisted in parts of Indonesia.
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SINGAPORE: The 24-hour Pollutant Standards Index (PSI) in Singapore's western and eastern regions remained in the unhealthy range as of 5pm, with readings in both regions creeping up to 103 after entering the unhealthy range at 101 an hour earlier.
This came after the PSI in the central region entered the unhealthy range at noon, reaching 102. By 5pm, the central region's reading had climbed to 117.
Singapore's air quality had returned to the unhealthy range earlier on Monday after four days of moderate readings, as hotspots and haze persisted in parts of Indonesia.
PSI readings in the northern and southern regions remained in the moderate range at 5pm.
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In an update on Monday, the National Environment Agency (NEA) said that it was closely monitoring air quality across Singapore.
It added that dry conditions had been observed across the southern region of the Association of Southeast Asian Nations (ASEAN) on Monday morning, except for showers over parts of Sumatra in Indonesia.
Hotspots were detected in southern Sumatra, as well as western, central and southern Kalimantan.
"A few hotspots were also detected in peninsular Malaysia and Java," NEA said, adding that moderate to dense haze had been observed in central and southern Sumatra, as well as western and central Kalimantan.
Transboundary haze was also observed in parts of Sarawak in East Malaysia, as well as peninsular Malaysia and southern Vietnam, with air quality monitoring stations in the affected areas reporting moderate to unhealthy readings.
Earlier in the month on Sep 4, the 24-hour PSI spiked into the unhealthy range in central Singapore for the first time since 2023, prompting NEA to start providing daily haze advisories from that evening.
The unhealthy PSI range is 101 to 200. Readings from 201 and 300 are considered "very unhealthy" and those above 300 are "hazardous".
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