Singapore air quality enters unhealthy range in three regions

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

A hazy skyline as seen from Sengkang Riverside Park on Sep 19, 2026. (File photo: CNA/Alyssa Tan)

This audio is generated by an AI tool.

SINGAPORE: Air quality in parts of Singapore were in the unhealthy range on Sunday (Sep 27), with the 24-hour Pollutant Standards Index (PSI) at 105 in the western region as of 6am.

The air quality in the central region had crossed the unhealthy threshold on Saturday evening, followed by the eastern region at midnight. The PSI readings for central and eastern regions hit 127 and 114 respectively as of 6am.

Air quality in other two regions of Singapore were in the moderate range, with the north at 89 and the south at 94.

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 The central region last recorded unhealthy air quality on the evening of Sep 20.

The central region last recorded unhealthy air quality on the evening of Sep 20.

On Saturday, the National Environment Agency (NEA) said in its daily haze advisory that the 24-hour PSI was forecast to be in the moderate to low unhealthy range.

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, said NEA.

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.

NEA also said that that while some showers are forecast over Singapore and parts of the surrounding region overnight and on Sunday, dry conditions are expected to continue over southern Sumatra and the southern and eastern parts of Kalimantan.

As such, there could be a risk of smoke haze affecting Singapore as the prevailing winds are forecast to blow from the southeast or southwest.

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.

Get our pick of top stories and thought-provoking articles in your inbox

Stay updated with notifications for breaking news and our best stories

Join our channel for the top reads for the day on your preferred chat app

过去几周，PSI读数一直在不健康范围内波动。

2026年9月19日，从盛港河滨公园看到的朦胧天际线。（资料照片：CNA/Alyssa Tan）

这段音频由人工智能工具生成。

新加坡：周日（9月27日），新加坡部分地区的空气质量处于不健康水平，截至早上6点，西部地区的24小时污染物标准指数（PSI）为105。

周六晚间，中部地区的空气质量已超过不健康标准，东部地区紧随其后，于午夜时分达到该标准。截至早上6点，中部和东部地区的空气污染指数（PSI）分别达到127和114。

新加坡其他两个地区的空气质量处于中等水平，北部为 89，南部为 94。

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 中部地区上一次记录到不健康空气质量是在9月20日晚上。

中部地区上一次记录到不健康空气质量是在9月20日晚上。

周六，国家环境局 (NEA) 在其每日雾霾预警中表示，预计 24 小时空气污染指数 (PSI) 将处于中低不健康范围。

国家环境局表示，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。

新加坡国家环境局还表示，虽然预计新加坡及周边地区今晚和周日会有阵雨，但苏门答腊南部以及加里曼丹南部和东部地区预计将继续保持干燥天气。

因此，由于预计盛行风向将来自东南或西南方向，新加坡可能会受到烟霾的影响。

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”。

订阅我们的邮件，即可获取精选热点新闻和引人深思的文章。

订阅通知，第一时间获取突发新闻和精彩报道。

加入我们的频道，即可在您常用的聊天应用上获取当日热门文章。