Air quality in four Singapore regions in unhealthy range

As of 6am on Tuesday, the PSI readings for the central, southern, western and eastern regions were 151, 128, 135 and 125, respectively.

Haze situation over the Central Business District, on Sep 14, 2026. (Photo: CNA/Raydza Rahman)

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SINGAPORE: Air quality in the central, southern, western and eastern parts of Singapore remained in the unhealthy range on Tuesday (Sep 29) morning. As of 6am on Tuesday, the 24-hour Pollutant Standards Index (PSI) readings for the central, southern, western and eastern regions were 151, 128, 135 and 125, respectively. The reading for the northern region remained in the moderate range at 98.

The 24-hour PSI readings for the central and southern regions first hit 104 and 103, respectively, at 8pm on Monday.

The air quality in the western region entered the unhealthy range at 9pm, with a PSI reading of 101.

Air quality in the eastern region subsequently dipped into the unhealthy band at midnight on Tuesday.

CNA Games Guess Word Crack the word, one row at a time Buzzword Create words using the given letters Mini Sudoku Tiny puzzle, mighty brain teaser Mini Crossword Small grid, big challenge Word Search Spot as many words as you can Show More Show Less PSI readings have dipped in and out of the unhealthy range over the past weeks.

PSI readings have dipped in and out of the unhealthy range over the past weeks.

In its latest media advisory on Monday evening, the National Environment Agency (NEA) said that the 24-hour PSI was forecast to be in the high moderate to mid-unhealthy range for the next 24 hours.

Moderate to dense smoke haze from fires in southern Sumatra and Kalimantan has drifted to Singapore, said NEA.

While some showers are forecast in Singapore on Tuesday, there remains a risk of smoke haze affecting Singapore, with the prevailing winds expected to blow from the east or southeast.

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 "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.

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截至周二早上6点，中部、南部、西部和东部地区的PSI读数分别为151、128、135和125。

2026年9月14日，中央商务区上空笼罩着雾霾。（图片：CNA/Raydza Rahman）

这段音频是由人工智能工具生成的。

新加坡：周二（9月29日）上午，新加坡中部、南部、西部和东部地区的空气质量仍处于不健康水平。截至周二上午6点，中部、南部、西部和东部地区的24小时空气污染指数（PSI）分别为151、128、135和125。北部地区的PSI读数为98，处于中等水平。

周一晚上 8 点，中部和南部地区的 24 小时 PSI 读数分别首次达到 104 和 103。

晚上9点，西部地区的空气质量进入不健康范围，PSI读数为101。

周二午夜，东部地区的空气质量随后降至不健康水平。

CNA游戏 猜词游戏 逐行破解单词 流行词游戏 用给定的字母组成单词 迷你数独 小小的谜题，强大的脑力挑战 迷你填字游戏 小方格，大挑战 单词搜索 尽可能多地找出单词 显示更多 显示更少 过去几周，PSI读数在不健康范围内波动。

过去几周，PSI读数一直在不健康范围内波动。

国家环境局（NEA）在周一晚间发布的最新媒体公告中表示，预计未来 24 小时内，24 小时空气污染指数（PSI）将处于高中度至中度不健康范围。

新加坡国家环境局表示，苏门答腊南部和加里曼丹的火灾产生的中度至重度烟雾已经飘到新加坡。

虽然预计新加坡周二会有一些阵雨，但由于盛行风向预计来自东部或东南部，新加坡仍存在受到烟霾影响的风险。

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 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 则被认为是“危险的”。

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