Air quality back in unhealthy range in central Singapore

The 24-hour PSI re-entered the unhealthy range in the central region at 9pm on Sunday.

A view of the haze in Singapore on Oct 4, 2026. (Photo: CNA)

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SINGAPORE: Air quality in central Singapore entered the unhealthy range again at 9pm on Sunday (Oct 4), while readings in the other four regions remained moderate.

At 9pm, the 24-hour Pollutant Standards Index (PSI) reading in the central region was 101. The readings in the other regions were 82 in the east, 83 in the west, 76 in the south and 78 in the north.

The 1-hour PM2.5 reading at 9pm, which reflects air quality at a single point in time, was in the elevated band in the central region.

In an update earlier on Sunday, the National Environment Agency (NEA) said moderate to dense smoke plumes from southern Sumatra continued to drift towards Singapore and the surrounding region. Smoke haze was also observed from fires in Kalimantan.

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 Dry weather is expected to continue over Singapore and the surrounding region on Monday. There remains a risk of smoke haze affecting Singapore under the prevailing southeasterly or southwesterly winds, NEA said. The 24-hour PSI for Singapore is forecast to be in the high moderate to low unhealthy range, the agency added.

Dry weather is expected to continue over Singapore and the surrounding region on Monday.

There remains a risk of smoke haze affecting Singapore under the prevailing southeasterly or southwesterly winds, NEA said.

The 24-hour PSI for Singapore is forecast to be in the high moderate to low unhealthy range, the agency added.

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

For immediate outdoor activities, people should refer to the 1-hour PM2.5 readings and corresponding personal guide, while the 24-hour PSI forecast and health advisories should be used when planning outdoor activities for the next day.

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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周日晚上9点，中部地区的24小时PSI指数再次进入不健康范围。

2026年10月4日新加坡的雾霾景象。（图片：CNA）

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新加坡：周日（10月4日）晚上9点，新加坡中部地区的空气质量再次进入不健康范围，而其他四个地区的空气质量则保持在中等水平。

晚上9点，中部地区的24小时污染物标准指数（PSI）读数为101。其他地区的读数分别为：东部82，西部83，南部76，北部78。

晚上 9 点的 1 小时 PM2.5 读数反映了某一时刻的空气质量，中部地区的 PM2.5 处于较高水平。

新加坡国家环境局（NEA）周日早些时候发布最新消息称，来自苏门答腊南部的中度至重度烟雾持续向新加坡及其周边地区飘移。此外，加里曼丹岛的火灾也造成了烟雾弥漫。

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 预计周一新加坡及其周边地区将持续干燥天气。新加坡国家环境局表示，在盛行的东南风或西南风的影响下，新加坡仍存在烟雾影响的风险。该机构补充说，预计新加坡24小时空气污染指数（PSI）将处于中高至低不健康范围内。

预计周一新加坡及周边地区将持续晴朗干燥天气。

新加坡国家环境局表示，在盛行的东南风或西南风的影响下，新加坡仍有可能受到烟霾的影响。

该机构补充说，预计新加坡24小时空气污染指数将处于高、中、低不健康范围。

新加坡国家环境局表示，雾霾对健康的影响取决于个人的健康状况、空气污染指数（PSI）以及户外活动的持续时间和强度。

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；而对于第二天的户外活动计划，则应该使用 24 小时 PSI 预报和健康建议。

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 则被认为是“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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