Haze in Singapore: Air quality at unhealthy range in central region

Air quality in three regions of Singapore started the day in the unhealthy range on Saturday (Sep 5), before improving later in the morning.

Pedestrians holding umbrellas silhouetted against a haze shrouded backdrop of buildings surrounding the Marina Bay, Sep 4, 2026. (Photo: CNA/Wallace Woon)

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SINGAPORE: Air quality in Singapore started the day in the unhealthy range in the west, central and east regions on Saturday (Sep 5), before improving somewhat later in the morning.

As of 9am, the 24-hour Pollutant Standards Index (PSI) was at 115 in the central region, according to the National Environment Agency (NEA).

Earlier at 6am, both the west and east regions were also in the unhealthy range, with a PSI of 103 and 102 respectively.

The west region dipped to 98 at 9am, as did the east region at 96.

The other regions remained in the moderate range, with the PSI at 83 in the north and 87 in the south.

The 24-hour PSI crossed into the unhealthy band of 101 to 200 at 7am on Friday, marking the first time the PSI had breached the level since Oct 8, 2023.

This prompted the NEA on Friday to start issuing daily haze advisories , including a 24-hour PSI forecast, to help the public plan activities and events for the following day.

In the first daily advisory on Friday evening, NEA said Singapore could continue to be affected by transboundary haze, with the 24-hour PSI forecast to be at the higher end of the moderate to the middle of the unhealthy range.

The 24-hour PSI is Singapore's indicator of daily air quality and forms the basis of NEA's daily health advisories. It is calculated using six air pollutants - PM2.5, PM10, ozone, sulphur dioxide, nitrogen dioxide and carbon monoxide.

The 1-hour PM2.5 reading, on the other hand, is the hourly average of the PM2.5 pollutant levels. PM2.5 is fine particulate matter with a diameter of 2.5 micrometres or shorter, and is the dominant pollutant during haze that causes harm to health.

While the 24-hour PSI is an average of the past 24 hours, the one-hour PM2.5 reading reflects the air quality at a single point in time.

A 24-hour PSI reading is considered "very unhealthy" when it is within the 201-300 range, and "hazardous" when it goes over 300.

In an earlier joint media release issued on behalf of agencies in the Haze Task Force (HTF), NEA said those in the task force have implemented their respective action plans and advisories to protect public health and well-being.

NEA's daily haze advisories will include the 24-hour PSI forecast, which can be used by the public to plan their activities and events for the next 24 hours.

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新加坡三个地区的空气质量在周六（9月5日）早晨处于不健康水平，之后在上午晚些时候有所改善。

2026年9月4日，行人撑着伞，在薄雾笼罩的滨海湾建筑群映衬下，勾勒出剪影。（图片：CNA/Wallace Woon）

这段音频由人工智能工具生成。

新加坡：周六（9月5日），新加坡西部、中部和东部地区的空气质量早晨处于不健康水平，之后在上午晚些时候有所改善。

根据国家环境局（NEA）的数据，截至上午9点，中部地区的24小时污染物标准指数（PSI）为115。

早上 6 点，西部和东部地区的空气污染指数 (PSI) 分别为 103 和 102，均处于不健康范围。

上午 9 点，西部地区气温降至 98 度，东部地区气温降至 96 度。

其他地区仍处于中等范围，北部 PSI 为 83，南部为 87。

周五早上 7 点，24 小时 PSI 指数突破了 101 至 200 的不健康区间，这是自 2023 年 10 月 8 日以来 PSI 指数首次突破该水平。

这促使国家环境局于周五开始发布每日雾霾预警，包括 24 小时 PSI 预报，以帮助公众规划第二天的活动和事件。

新加坡国家环境局在周五晚间发布的第一份每日空气质量预报中表示，新加坡可能继续受到跨境雾霾的影响，预计24小时空气污染指数将处于中等偏上水平，接近不健康水平。

24小时空气污染指数（PSI）是新加坡衡量每日空气质量的指标，也是国家环境局（NEA）每日健康建议的基础。该指数由六种空气污染物计算得出，分别是：PM2.5、PM10、臭氧、二氧化硫、二氧化氮和一氧化碳。

另一方面，1 小时 PM2.5 读数是 PM2.5 污染物浓度的小时平均值。PM2.5 是直径为 2.5 微米或更短的细颗粒物，是雾霾期间造成健康危害的主要污染物。

24 小时 PSI 是过去 24 小时的平均值，而 1 小时 PM2.5 读数反映的是某一时刻的空气质量。

24 小时 PSI 读数在 201-300 范围内被认为是“非常不健康的”，超过 300 则被认为是“危险的”。

国家环境局 (NEA) 早前代表雾霾工作组 (HTF) 各机构联合发布的新闻稿中表示，工作组成员已落实各自的行动计划和建议，以保护公众健康和福祉。

新加坡国家环境局每日发布的雾霾预警将包含 24 小时 PSI 预报，公众可利用该预报来安排未来 24 小时的活动和事件。

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