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Western Singapore air quality reaches unhealthy levels as PSI hits 102

Air quality in western Singapore deteriorated to unhealthy levels on September 4, with the Pollutant Standards Index reaching 102. The reading joins the central region in experiencing unhealthy air conditions.

LSN Singapore · 5 September 2026

Western Singapore air quality reaches unhealthy levels as PSI hits 102

The Pollutant Standards Index in western Singapore climbed to 102 on September 4, marking the region's entry into the unhealthy air quality category. This development brings western Singapore in line with the central region, which has also been grappling with degraded air conditions.

The eastern region experienced a similar trajectory, with PSI readings reaching unhealthy levels late on September 4 before improving slightly to 99 by September 5. The fluctuations underscore the dynamic nature of air quality across the island, with different zones experiencing varying degrees of pollution.

The unhealthy air quality readings have prompted heightened monitoring and awareness across Singapore. Authorities continue to track atmospheric conditions closely as residents in affected areas are advised to take precautionary measures to protect their health during periods of poor air quality.

Multiple regions experiencing unhealthy PSI levels simultaneously highlights the broader air quality challenges facing the island and the wider region. The situation remains under review as environmental agencies continue their assessments.