Air quality in unhealthy range across most of Singapore

In an update on Monday evening, the National Environment Agency said the 24-hour PSI for Singapore was forecast to be in the high moderate to mid unhealthy range.

A woman is seen wearing a mask in central Bishan during hazy conditions on the evening of Oct 5, 2026. (Photo: CNA/Marcus Mark Ramos)

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SINGAPORE: Air quality in four of Singapore’s five regions remained in the unhealthy range on Tuesday (Oct 6) morning, while the south improved to the moderate range after all regions recorded unhealthy readings on Monday.

As of 6am, the 24-hour Pollutant Standards Index (PSI) readings were 130 in central Singapore, 117 in the west, 112 in the east and 107 in the north.

The 24-hour PSI reading in southern Singapore was 95, within the moderate range.

The 1-hour PM2.5 readings, which give a more current indication of air quality, were in the elevated band in central, western and eastern Singapore at 6am.

For immediate outdoor activities, people should refer to the 1-hour PM2.5 readings and corresponding personal guide, the National Environment Agency (NEA) said.

The 24-hour PSI forecast and health advisories should be used when planning outdoor activities for the next 24 hours.

When 1-hour PM2.5 levels are elevated, healthy people are advised to reduce strenuous outdoor activity for the next hour, while the elderly, pregnant women, children and people with chronic heart or lung conditions should avoid such activity.

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In an update on Monday evening, NEA said moderate to dense smoke plumes in the southern parts of Sumatra were observed drifting into Singapore, while smoke haze was also observed in parts of Kalimantan.

Dry conditions are expected to persist over southern Sumatra and Kalimantan. With prevailing winds expected to blow from the southeast or east-southeast, smoke haze could continue to drift towards Singapore, NEA said.

The 24-hour PSI for Singapore was forecast to be in the high moderate to mid unhealthy range, NEA said.

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 - and reflects the average air quality of the past 24 hours.

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.

A 24-hour PSI reading is considered "unhealthy" when it is in the 101 to 200 range, "very unhealthy" when it is within the 201-300 range and "hazardous" when it goes over 300.

The hourly PM2.5 reading is classified in four bands: normal, elevated, high and very high. It is considered elevated when it ranges from 56 to 150. The "high" band ranges from 151 to 250, and readings above that are classified as "very high".

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新加坡国家环境局周一晚间发布最新消息称，预计新加坡24小时空气污染指数（PSI）将处于中度至中度不健康范围内。

2026年10月5日晚，碧山中心地带雾霾弥漫，一名女子戴着口罩现身。（图片：CNA/Marcus Mark Ramos）

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新加坡：周二（10 月 6 日）上午，新加坡五个地区中有四个地区的空气质量仍处于不健康水平，而南部地区的空气质量在周一所有地区空气质量均达到不健康水平后，有所改善至中等水平。

截至早上 6 点，新加坡中部 24 小时污染物标准指数 (PSI) 读数为 130，西部为 117，东部为 112，北部为 107。

新加坡南部 24 小时 PSI 读数为 95，处于中等范围。

早上 6 点，新加坡中部、西部和东部的 1 小时 PM2.5 读数处于较高水平，这可以更准确地反映当前的空气质量。

国家环境局（NEA）表示，对于即将进行的户外活动，人们应该参考1小时PM2.5读数和相应的个人指南。

在计划未来 24 小时的户外活动时，应参考 24 小时 PSI 预报和健康建议。

当 1 小时 PM2.5 水平升高时，建议健康人群在接下来的一个小时内减少剧烈的户外活动，而老年人、孕妇、儿童以及患有慢性心脏或肺部疾病的人应避免此类活动。

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周一晚间，新加坡国家环境局发布最新消息称，苏门答腊南部地区出现中等至浓重的烟雾，并飘向新加坡；加里曼丹部分地区也出现了烟雾。

预计苏门答腊南部和加里曼丹岛将持续干燥天气。新加坡国家环境局表示，由于盛行风向预计为东南风或东南偏东风，烟雾可能继续向新加坡方向飘移。

新加坡国家环境局表示，预计新加坡24小时空气污染指数将处于中度偏高至中度不健康范围内。

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。它使用六种空气污染物——PM2.5、PM10、臭氧、二氧化硫、二氧化氮和一氧化碳——计算得出，反映了过去24小时的平均空气质量。

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 读数在 101 到 200 范围内被认为是“不健康的”，在 201 到 300 范围内被认为是“非常不健康的”，超过 300 时被认为是“危险的”。

PM2.5 每小时读数分为四个等级：正常、偏高、高和非常高。当读数在 56 至 150 之间时，被视为偏高；“高”等级的范围为 151 至 250；高于此范围的读数则被归类为“非常高”。

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