Haze in S’pore: Air quality in central region hovers between moderate and unhealthy bands

Hazy conditions in North Bridge Road at 1.10pm on Oct 3.

Published Oct 04, 2026, 07:14 AM

Updated Oct 04, 2026, 09:44 AM

Air quality in central Singapore fluctuated between moderate and unhealthy bands from Oct 3 to Oct 4, with PSI readings reaching 103 at one point.

The haze is caused by smoke plumes from fires in southern Sumatra and Kalimantan, with dry conditions and prevailing winds expected to sustain the haze risk.

The PSI hitting unhealthy levels marks the first such occurrence since October 2023, linked to El Nino and Indian Ocean Dipole effects, while warm and dry weather is forecast to continue.

SINGAPORE – Air quality in the central region of the island lingered between the moderate and unhealthy bands on the morning of Oct 4.

The 24-hour Pollutant Standards Index (PSI) reading in that area of Singapore had mostly been in the unhealthy range since 11am on Oct 3, but dipped temporarily into the moderate range at 11pm that night and then again at 9am on Oct 4.

The PSI value stood at 100 at 11pm on Oct 3, before inching upwards two hours later and reaching 103 at 3am on Oct 4.

At 9am on Oct 4, the PSI reading in the central region dropped back to 100, returning to the upper end of the moderate range.

The values for the other parts of Singapore remained in the moderate range, ranging between 78 and 88 at 9am .

The PSI reading is a 24-hour rolling average of six key air pollutants and is used in planning for outdoor activities the next day.

Air quality is considered unhealthy when the 24-hour PSI is in the range of 101 to 200, during which the National Environment Agency (NEA) advises the public to at least reduce outdoor activities. PSI readings of 51 to 100 are considered moderate, while values of zero to 50 are in the “good” range.

The air quality started worsening at 11am on Oct 3 when the 24-hour PSI hit 102 , the first time the reading in any region here reached unhealthy levels since 10pm on Sept 30.

Meanwhile, the one-hour PM 2.5 readings, which are used as a gauge for immediate activities, stood in the normal range between 19 and 49 , across all regions at 9am .

PM2.5 readings, which indicate the current concentrations of fine particulate matter, are considered elevated if they fall between 56 and 150, and high if they are between 151 and 250.

In its daily haze advisory on Oct 3, NEA said the 24-hour PSI is forecast to be in the “moderate to low unhealthy” range.

Moderate to dense smoke plumes from southern Sumatra were observed drifting towards Singapore and the surrounding region with smoke haze also observed from fires in Kalimantan.

Dry conditions are forecast to continue over Singapore and the surrounding region on Oct 4. The risk of smoke haze affecting the Republic remains as the prevailing winds are expected to blow from the south-east or south-west.

The PSI crossed into the unhealthy range a month ago , hitting 101 in central Singapore on the morning of Sept 4. In the days that followed, readings in the central, eastern and western parts of the island occasionally crossed into the unhealthy range.

The developments in September and October mark the first time since October 2023 that the PSI in Singapore hit unhealthy levels because of haze, with the authorities earlier warning of the risk of haze between June and October as a result of warmer and drier conditions brought on by both El Nino and the Indian Ocean Dipole.

Meanwhile, fair and warm conditions are expected on several days, particularly during the first week of the month, said the Meteorological Service Singapore in its fortnightly weather advisory on Oct 1.

The total rainfall for the first half of the month is forecast to be below average across most of the island, making it drier than the previous two weeks.

However, localised thundery showers may fall over parts of Singapore in the late morning and afternoon on a few days.

Daily temperatures are likely to reach a high of between 34 deg C and 35 deg C on most days, and could exceed 35 deg C on a few days.

Some nights may be warm and humid, with temperatures above 27 deg C.

10月3日下午1点10分，北桥路出现雾霾天气。

发布于 2026 年 10 月 4 日上午 7:14

更新于2026年10月4日上午9:44

10 月 3 日至 4 日，新加坡中部地区的空气质量在“中等”和“不健康”级别之间波动，PSI 读数一度达到 103。

雾霾是由苏门答腊南部和加里曼丹的火灾产生的烟柱造成的，干燥的气候和盛行的风向预计将持续造成雾霾风险。

PSI 指数达到不健康水平，这是自 2023 年 10 月以来首次出现这种情况，与厄尔尼诺现象和印度洋偶极子效应有关，同时预计温暖干燥的天气将持续。

新加坡——10月4日上午，该岛中部地区的空气质量徘徊在中等和不健康之间。

新加坡该地区的 24 小时污染物标准指数 (PSI) 读数自 10 月 3 日上午 11 点以来大多处于不健康范围，但在当晚 11 点和 10 月 4 日上午 9 点短暂降至中等范围。

10 月 3 日晚上 11 点，PSI 值为 100，两小时后开始缓慢上升，10 月 4 日凌晨 3 点达到 103。

10 月 4 日上午 9 点，中部地区的 PSI 读数回落至 100，回到中等范围的上限。

新加坡其他地区的数值保持在中等范围内，上午 9 点介于 78 至 88 之间。

PSI读数是六种主要空气污染物的24小时滚动平均值，用于规划第二天的户外活动。

当24小时空气污染指数（PSI）在101至200之间时，空气质量被认为是不健康的。此时，国家环境局（NEA）建议公众至少减少户外活动。PSI读数在51至100之间被认为是中等的，而0至50之间的数值则属于“良好”范围。

10 月 3 日上午 11 点，空气质量开始恶化，24 小时 PSI 值达到 102，这是自 9 月 30 日晚上 10 点以来，该地区任何区域的读数首次达到不健康水平。

与此同时，上午 9 点，所有地区的 PM2.5 一小时读数（用作衡量当前活动的指标）均处于 19 至 49 的正常范围内。

PM2.5 读数表示当前细颗粒物的浓度，如果读数在 56 到 150 之间则被认为是升高的，如果读数在 151 到 250 之间则被认为是高的。

10月3日，国家环境局在其每日雾霾预警中表示，预计24小时空气污染指数将处于“中度至轻度不健康”范围。

观测到苏门答腊南部中度至重度烟雾飘向新加坡及周边地区，同时加里曼丹的火灾也产生了烟雾。

预计10月4日新加坡及其周边地区将持续干燥天气。由于盛行风向预计为东南风或西南风，新加坡仍存在烟雾影响的风险。

一个月前，新加坡空气污染指数（PSI）进入不健康范围，9月4日上午，新加坡中部地区的PSI达到101。在接下来的几天里，该岛中部、东部和西部地区的读数偶尔也会进入不健康范围。

9 月和 10 月的情况表明，自 2023 年 10 月以来，新加坡的空气污染指数 (PSI) 首次因雾霾达到不健康水平。此前，由于厄尔尼诺现象和印度洋偶极子现象带来的气候变暖和干燥，当局曾警告称，6 月至 10 月期间存在雾霾风险。

与此同时，新加坡气象局在 10 月 1 日发布的双周天气预报中表示，预计未来几天天气晴朗温暖，尤其是在本月的第一周。

预计本月上半月全岛大部分地区的总降雨量将低于平均水平，比前两周更加干燥。

不过，未来几天，新加坡部分地区在上午晚些时候和下午可能会出现局部雷阵雨。

大多数日子里，每日最高气温可能达到 34 摄氏度至 35 摄氏度，少数日子可能会超过 35 摄氏度。

有些夜晚可能会温暖潮湿，气温超过 27 摄氏度。