Air quality to remain in moderate to low unhealthy range on Wednesday: NEA

Moderate to dense smoke plumes continue to be observed from fires in southern and central Sumatra and Kalimantan, said NEA.

A view from Jurong West of the haze situation in Singapore on Sep 4, 2026. (Photo: CNA/Ili Mansor)

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SINGAPORE: Air quality in Singapore remained in the moderate range on Tuesday (Sep 8), with the National Environment Agency (NEA) forecasting the 24-hour Pollutant Standards Index (PSI) for Wednesday to be in the moderate to low unhealthy range.

The 24-hour PSI was between 62 and 74 as at 6pm on Tuesday.

In Its health advisory, NEA said that if the air quality over the next 24-hours is in the moderate range, all groups - healthy people, the elderly, pregnant women, children and those with chronic lung or heart disease - can continue with normal activities.

If the air quality is unhealthy, healthy individuals should reduce prolonged or strenuous outdoor physical exertion. In such instances, the elderly, pregnant women and children should minimise such activities, and those with chronic lung and heart disease should avoid them altogether.

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NEA said that moderate to dense smoke plumes continue to be observed from fires in southern and central Sumatra and Kalimantan, with some smoke haze drifting towards Singapore from isolated nearby fires.

“With dry conditions expected to persist over southern Sumatra and parts of Kalimantan in the coming days, there remains a risk of smoke haze,” said NEA.

NEA added that the health impact of haze depends on a person's health status, the PSI level, and the length and intensity of outdoor activity.

It advised the public to check the one-hour PM2.5 concentration readings for immediate outdoor activities, and to use the 24-hour PSI forecast and corresponding health advisories when planning outdoor activities for the next day.

NEA began issuing daily haze advisories on Sep 4 after the 24-hour PSI in the central region crossed into the unhealthy band of 101 to 200 at 7am, marking the first time the PSI had breached the level since Oct 8, 2023. Air quality deteriorated steadily throughout the day, with the central, eastern and western regions all recording unhealthy PSI levels by midnight.

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.

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国家环境局表示，苏门答腊岛南部和中部以及加里曼丹岛的火灾持续产生中等至浓重的烟雾。

2026年9月4日，从裕廊西拍摄的新加坡雾霾景象。（图片：CNA/Ili Mansor）

这段音频由人工智能工具生成。

新加坡：周二（9月8日），新加坡的空气质量仍处于中等水平。国家环境局（NEA）预测，周三的24小时污染物标准指数（PSI）将处于中等至低度不健康水平。

截至周二下午 6 点，24 小时 PSI 值在 62 至 74 之间。

新加坡国家环境局在其健康建议中表示，如果未来 24 小时内空气质量处于中等水平，所有人群——健康人群、老年人、孕妇、儿童以及患有慢性肺病或心脏病的人——都可以继续进行正常活动。

如果空气质量不佳，健康人群应减少长时间或剧烈的户外体力活动。在这种情况下，老年人、孕妇和儿童应尽量减少此类活动，而患有慢性肺病和心脏病的人则应完全避免此类活动。

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新加坡国家环境局表示，苏门答腊岛南部和中部以及加里曼丹岛的火灾持续产生中等至浓重的烟雾，一些烟雾从附近零星的火灾中飘向新加坡。

国家环境局表示：“预计未来几天苏门答腊南部和加里曼丹部分地区将持续干燥，因此仍存在烟雾风险。”

新加坡国家环境局补充说，雾霾对健康的影响取决于个人的健康状况、PSI 指数以及户外活动的持续时间和强度。

它建议公众查看一小时 PM2.5 浓度读数，以便进行即时的户外活动；并建议在计划第二天的户外活动时，参考 24 小时 PSI 预报和相应的健康建议。

9月4日，新加坡国家环境局（NEA）开始每日发布雾霾预警。当天上午7点，中部地区的24小时空气污染指数（PSI）突破101至200的不健康范围，这是自2023年10月8日以来PSI首次突破该水平。空气质量在当天持续恶化，到午夜时分，中部、东部和西部地区的PSI均已达到不健康水平。

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”。

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