Haze in S’pore: Air quality returns to moderate levels in all regions

The haze as seen from Middle Road at 7.15am on Sept 30, 2026. The 24-hour Pollutant Standards Index (PSI) reading in the southern region was 112 at the time.

ST PHOTO: KUA CHEE SIONG

Published Sep 30, 2026, 11:15 PM

Updated Sep 30, 2026, 11:15 PM

The 24-hour Pollutant Standards Index (PSI) in Singapore returned to moderate levels across all regions by 11pm on Sept 30, after reaching unhealthy peaks earlier in the haze season.

The highest PSI recorded was 164 on Sept 29 in the central region, surpassing previous highs and causing air quality to enter the unhealthy range across all five regions.

NEA forecasts moderate to low unhealthy haze levels continuing due to dry conditions in nearby areas, with showers expected but smoke haze risk remains due to prevailing south-east or south winds.

SINGAPORE – The 24-hour Pollutant Standards Index (PSI) readings across all regions returned to moderate levels as at 11pm on Sept 30.

This comes after the central region reached a new peak this haze season early on Sept 29, when air quality across Singapore breached the unhealthy band for the first time in two weeks.

As at 11pm on Sept 30, the PSI reading for the central region was 99, while the values for the other regions ranged from 81 to 99. This is down from a peak of 134 in the central and western regions earlier in the day at 1am.

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.

Early on Sept 29, the PSI value in the central region reached a new peak this haze season, standing at 164 at 10am, surpassing the previous high of 154 on Sept 15.

Also on Sept 29, the readings in all five regions here surpassed the 101 threshold into the unhealthy range. The last time that happened was also Sept 15.

The hourly PM2.5 readings for all regions are all in the normal band as of 11pm on Sept 30, with the values ranging between 18 and 37.

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.

NEA has advised the public to refer to the hourly PM2.5 reading if they are considering immediate activities and the 24-hour PSI readings to plan for the day ahead.

In its daily haze advisory on Sept 30, NEA said the 24-hour PSI is forecast to be in the “moderate to low unhealthy” range, following an improvement in the haze situation with showers over Singapore and the surrounding region.

Dry conditions are forecast to continue over parts of southern Sumatra and south-western Kalimantan. While showers are expected over Singapore and the surrounding region again on Oct 1, the risk of smoke haze affecting the Republic remains as the prevailing winds are expected to blow from the south-east or south.

The PSI crossed into the unhealthy range around four weeks 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 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.

Dilenjit Singh is a correspondent at The Straits Times’ breaking news desk.

2026年9月30日上午7点15分，从中路看到的雾霾。当时南部地区的24小时污染物标准指数（PSI）读数为112。

《海峡时报》摄影：郭志雄

发布于 2026 年 9 月 30 日晚上 11:15

更新于2026年9月30日晚上11:15

新加坡 24 小时污染物标准指数 (PSI) 在雾霾季早期达到不健康峰值后，于 9 月 30 日晚上 11 点恢复到所有地区的中等水平。

9 月 29 日，中部地区空气污染指数 (PSI) 达到最高值 164，超过了以往的最高值，导致所有五个地区的空气质量均进入不健康范围。

国家环境局预测，由于附近地区天气干燥，中低度不健康雾霾将持续存在，虽然预计会有阵雨，但由于盛行东南风或南风，烟雾风险依然存在。

新加坡——截至9月30日晚上11点，所有地区的24小时污染物标准指数（PSI）读数均恢复至中等水平。

此前，新加坡中部地区的雾霾在9月29日达到本季雾霾季的新高峰，当时新加坡的空气质量两周以来首次突破不健康标准。

截至9月30日晚上11点，中部地区的PSI读数为99，而其他地区的数值在81到99之间。这比当天凌晨1点中部和西部地区134的峰值有所下降。

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。

9 月 29 日清晨，中部地区的 PSI 值达到了本雾霾季的新高峰，上午 10 点达到 164，超过了 9 月 15 日创下的 154 的前一个最高值。

9月29日，本地五个地区的空气质量指数均超过101，进入不健康范围。上一次出现这种情况是在9月15日。

截至 9 月 30 日晚上 11 点，所有地区的 PM2.5 每小时读数均在正常范围内，数值介于 18 至 37 之间。

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。

国家环境局建议公众，如果考虑立即进行活动，请参考每小时的 PM2.5 读数；如果考虑安排当天的活动，请参考 24 小时的 PSI 读数。

新加坡国家环境局 (NEA) 在 9 月 30 日发布的每日雾霾预警中表示，随着新加坡及周边地区降雨，雾霾情况有所改善，预计 24 小时空气污染指数 (PSI) 将处于“中度至轻度不健康”范围。

预计苏门答腊南部和加里曼丹西南部部分地区将持续干燥天气。虽然新加坡及其周边地区预计10月1日将再次迎来阵雨，但由于盛行风向预计为东南风或南风，新加坡仍面临烟雾影响的风险。

大约四周前，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 月份的情况标志着自 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，当局曾警告称，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，6 月至 10 月期间存在雾霾风险。

迪伦吉特·辛格是《海峡时报》突发新闻编辑部的记者。