Haze in Singapore: Air quality improves overnight with ‘normal’ PM2.5 readings across the island

The National Environment Agency forecast that unhealthy air quality, with PSI levels ranging from 101 to 160, is expected on Oct 22.

Published Oct 22, 2026, 06:05 AM

Updated Oct 22, 2026, 06:07 AM

SINGAPORE – The air quality in Singapore improved overnight as the hourly PM2.5 readings returned to “normal” for all regions and the 24-hour PSI levels stood in the “good to moderate” range for most regions.

At 6am on Oct 22, the one-hour PM2.5 were 38 in the north, 40 in the south, 37 in the east, 36 in the west and 32 in the central region.

The readings have been in the “normal” range for all five regions since 1am.

The hourly PM2.5 readings are measured in micrograms per cubic metre and are a gauge of the current air quality.

Scores from zero to 55 represent normal values, those between 56 and 150 indicate an elevated concentration of fine particles, readings between 151 and 250 are considered high, and scores above 251 are classified as very high.

For healthy people, short-term exposure to high levels of haze particles may cause irritation of the eyes, nose, and throat.

Haze particles can also affect the heart and lungs, especially in people who already have chronic heart or lung disease, such as asthma, chronic obstructive pulmonary disease, or heart failure.

The highest PM2.5 reading this haze season was recorded at 3pm on Oct 14 in the western part of the island at 288.

Meanwhile, the 24-hour Pollutant Standards Index (PSI) stood in the “good to moderate” range in the north (75), south (85), east (85) and central (98), with only the west (112) recording figures in the unhealthy range.

Air quality is considered “good to moderate” when the PSI – a 24-hour rolling average of six key air pollutants – is in the range of 0 to 100, and “unhealthy” when it is in the range of 101 to 200. Beyond 200, it enters the “very unhealthy” band.

The highest 24-hour PSI reading this haze season was recorded at 10am on Oct 18, when it hit 230 in the western region, in the very unhealthy range.

Unhealthy air quality forecast for Oct 22

In an advisory on the evening of Oct 21, the National Environment Agency (NEA) said that unhealthy air quality is expected on Oct 22. PSI levels may range from 101 to 160.

Showers fell mainly over western Singapore in the afternoon of Oct 21 and smoke haze from Kalimantan was observed near Singapore, the agency said.

Smoke haze was also observed over Sumatra.

While showers are forecast over Singapore and the surrounding region on Oct 22, dry conditions are expected over the southern parts of Kalimantan, NEA said.

Under prevailing east-southeasterly or south-easterly winds, smoke haze from fires in Kalimantan may be transported towards Singapore, it added.

Smoke haze from fires in the region may continue to drift towards Singapore on Oct 23 due to south-easterly or south-southeasterly winds.

On Oct 24, winds are expected to shift to blow towards the south-west. Given the dry conditions forecast over southern and central Sumatra, smoke haze from Sumatra may drift towards Singapore, NEA added.

Singapore is currently experiencing its 18th day of unhealthy air – surpassing the 14-day stretch during the 2015 haze crisis, during which bad air persisted from Sept 23 to Oct 7.

National Environment Agency

国家环境局预测，10 月 22 日空气质量将达到不健康水平，PSI 值介于 101 至 160 之间。

发布于 2026 年 10 月 22 日上午 6:05

更新于2026年10月22日 上午6:07

新加坡——新加坡的空气质量一夜之间有所改善，所有地区的PM2.5小时读数均恢复到“正常”水平，大多数地区的24小时PSI值也处于“良好至中等”的范围内。

10 月 22 日上午 6 点，一小时 PM2.5 浓度在北部为 38，南部为 40，东部为 37，西部为 36，中部为 32。

自凌晨 1 点以来，五个地区的读数均处于“正常”范围内。

PM2.5 每小时读数以微克/立方米为单位测量，是衡量当前空气质量的指标。

0 到 55 分代表正常值，56 到 150 分表示细颗粒物浓度升高，151 到 250 分被认为是高浓度，251 分以上则被归类为非常高浓度。

对于健康人群而言，短期暴露于高浓度雾霾颗粒物中可能会引起眼睛、鼻子和喉咙刺激。

雾霾颗粒也会影响心脏和肺部，尤其是对那些已经患有慢性心脏或肺部疾病的人，例如哮喘、慢性阻塞性肺病或心力衰竭。

本雾霾季PM2.5最高读数于10月14日下午3点在岛屿西部记录到，为288。

与此同时，北部（75）、南部（85）、东部（85）和中部（98）的 24 小时污染物标准指数 (PSI) 处于“良好至中等”范围，只有西部（112）的数值处于不健康范围。

当 PSI（六种主要空气污染物的 24 小时滚动平均值）在 0 到 100 之间时，空气质量被认为是“良好至中等”；当 PSI 在 101 到 200 之间时，空气质量被认为是“不健康”；超过 200，则进入“非常不健康”的级别。

10 月 18 日上午 10 点，本雾霾季 24 小时 PSI 读数最高，西部地区达到 230，处于非常不健康的范围内。

10月22日空气质量预报显示空气质量不健康

10月21日晚间，国家环境局（NEA）发布公告称，预计10月22日空气质量将达到不健康水平，PSI值可能在101至160之间。

该机构表示，10月21日下午，新加坡西部地区主要下起了阵雨，加里曼丹岛的烟雾在新加坡附近出现。

苏门答腊岛上空也出现了烟雾。

新加坡国家环境局表示，虽然预计10月22日新加坡及其周边地区会有阵雨，但加里曼丹南部地区预计天气干燥。

报告还指出，在盛行的东南偏东风或东南风的影响下，加里曼丹岛火灾产生的烟雾可能会被吹向新加坡。

受东南风或南东南风的影响，该地区火灾产生的烟雾可能在 10 月 23 日继续向新加坡飘去。

预计10月24日风向将转为西南风。新加坡国家环境局补充说，鉴于苏门答腊南部和中部地区预计将出现干燥天气，苏门答腊的烟霾可能会飘向新加坡。

新加坡目前已连续 18 天空气质量不佳，超过了 2015 年雾霾危机期间的 14 天，当时空气质量差的情况从 9 月 23 日持续到 10 月 7 日。

国家环境局