Singapore air quality enters unhealthy range in central region; 24-hour PSI breaches 100

The 24-hour PSI in the central part of Singapore crossed into the unhealthy band at 7am on Friday (Sep 4).

A view of the haze as seen from Skyville @ Dawson, Singapore, during the afternoon of Aug 25, 2026. (Photo: CNA/Syamil Sapari)

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SINGAPORE: Air quality in the central region of Singapore reached unhealthy levels on Friday (Sep 4), with the 24-hour Pollutant Standards Index (PSI) exceeding 100, according to data from the National Environment Agency (NEA).

According to the readings shown on the air-quality dashboard at 7am, the 24-hour PSI was 101 in the central region, crossing into the unhealthy band of 101 to 200. It inched up to 103 an hour later.

Readings elsewhere remained in the moderate range. At 8am, the 24-hour PSI was 88 in the west, 87 in the east, 77 in the north and 75 in the south.

The 24-hour PSI was developed as an indicator of Singapore's daily air quality and is the reading that NEA's daily health advisories are based on. It is computed based on six air pollutants - PM2.5, PM10, ozone, sulphur dioxide, nitrogen dioxide and carbon monoxide.

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 Meanwhile, the 1-hour PM2.5 reading 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.

Meanwhile, the 1-hour PM2.5 reading 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.

In its latest update on the weather and haze situation, NEA noted on its website that many air quality stations in Kalimantan, the central and southern parts of Sumatra, as well as in Sabah and Sarawak recorded unhealthy to hazardous levels.

It added that scattered to widespread hotspots were detected in Kalimantan and the southern and central parts of Sumatra, while some hotspots were detected elsewhere in the southern ASEAN region, where dry conditions persist in many areas.

Meanwhile, moderate to dense transboundary haze was observed over the northern parts of Borneo and the southwestern parts of the Philippines. Moderate to dense smoke plumes were also seen in many parts of Kalimantan, the central and southern parts of Sumatra and the central parts of Sarawak.

"Over the next few days, dry conditions are forecast over many parts of the southern ASEAN region, apart from the northern parts of Peninsular Malaysia and Sumatra, and the central parts of Borneo, where showers are expected," said NEA.

It added that the hotspot and smoke haze situation is expected to remain elevated in fire-prone regions experiencing prolonged dry conditions, with a continued risk of severe transboundary haze occurrence.

NEA said that it will issue daily haze advisories when the 24-hour PSI enters the unhealthy range, defined as a reading above 100.

At the start of August, the ASEAN Specialised Meteorological Centre raised its alert to Level 2 for the southern Association of Southeast Asian Nations region. This is the second-highest level, signalling an increasing risk of transboundary haze.

The alert indicates escalating hotspot activity, with moderate to dense smoke haze observed over two or more consecutive days.

The 28 public agencies that make up the government's inter-agency haze task force are ready to roll out their respective action plans if air quality deteriorates into the unhealthy range, the authorities said previously.

Chaired by NEA, the task force develops and rolls out plans to minimise and manage the impact of haze here, with agencies able to adopt tiered responses based on air quality readings and forecasts.

The task force convenes yearly before the start of the dry season in June to update its plans. It has met twice so far this year – once at the end of January, following peatland and vegetation fires in east Johor, and again in April.

Members of the public may access updates via NEA's website, the haze microsite , the myENV application and the agency's social media channels.

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新加坡中部地区的 24 小时 PSI 指数于周五（9 月 4 日）早上 7 点进入不健康范围。

2026年8月25日下午，从新加坡道森的Skyville观景台拍摄的雾霾景象。（图片：CNA/Syamil Sapari）

这段音频由人工智能工具生成。

新加坡：根据国家环境局（NEA）的数据，新加坡中部地区的空气质量在周五（9月4日）达到不健康水平，24小时污染物标准指数（PSI）超过100。

根据早上 7 点空气质量仪表盘上的读数，中部地区的 24 小时 PSI 为 101，进入了 101 至 200 的不健康范围。一小时后，该数值小幅上升至 103。

其他地区的读数仍处于中等水平。上午8点，西部地区24小时平均气压强度为88，东部地区为87，北部地区为77，南部地区为75。

24小时空气污染指数（PSI）是衡量新加坡每日空气质量的指标，也是国家环境局（NEA）每日健康建议的依据。该指数根据六种空气污染物计算得出，包括PM2.5、PM10、臭氧、二氧化硫、二氧化氮和一氧化碳。

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 小谜题，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 同时，1小时PM2.5读数是PM2.5污染物水平的小时平均值。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。

同时，1 小时 PM2.5 读数是 PM2.5 污染物浓度的小时平均值。PM2.5 是指直径为 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。

国家环境局在其网站上发布的最新天气和雾霾情况更新中指出，加里曼丹、苏门答腊中部和南部以及沙巴和砂拉越的许多空气质量监测站记录到不健康到危险的空气质量水平。

报告还指出，加里曼丹岛和苏门答腊岛南部和中部地区发现了零星到大范围的热点地区，而东盟南部其他地区也发现了一些热点地区，这些地区许多地方持续干旱。

与此同时，婆罗洲北部和菲律宾西南部地区观测到中度至重度跨境雾霾。加里曼丹岛多地、苏门答腊岛中部和南部以及沙捞越中部地区也观测到中度至重度烟柱。

国家环境局表示：“未来几天，除马来西亚半岛北部、苏门答腊岛北部以及婆罗洲中部地区预计有阵雨外，东盟南部大部分地区预计将出现干燥天气。”

报告还指出，在持续干旱的易燃地区，热点和烟霾情况预计将持续高发，并存在发生严重跨境烟霾的风险。

国家环境局表示，当 24 小时空气污染指数 (PSI) 进入不健康范围（定义为读数超过 100）时，将发布每日雾霾预警。

8月初，东盟专业气象中心将东盟南部地区的预警级别提升至二级。这是第二高的级别，表明跨境雾霾的风险正在增加。

警报表明热点活动正在加剧，连续两天或两天以上观测到中度至重度烟雾。

此前，有关部门表示，组成政府跨部门雾霾工作组的28个公共机构已准备好在空气质量恶化到不健康水平时推出各自的行动计划。

该工作组由国家环境局 (NEA) 主持，负责制定和实施计划，以最大限度地减少和管理雾霾的影响，各机构可以根据空气质量读数和预测采取分级应对措施。

该工作组每年在六月旱季开始前召开会议，更新其计划。今年迄今为止，该工作组已召开两次会议——一次是在一月底，当时柔佛州东部发生泥炭地和植被火灾；另一次是在四月。

公众可通过国家环境局网站、雾霾微网站、myENV应用程序和该机构的社交媒体渠道获取最新信息。

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