Haze watch: Air quality improves as PSI returns to moderate levels across Singapore

Residents in Singapore started October (Oct 1) with a clearer skyline and improved air quality as the 24-hour Pollutant Standards Index (PSI) returned to the moderate range in all five regions.

The central and western regions returned to the moderate range at 11pm on Wednesday, while the western and southern regions exited the unhealthy range at 9pm and 6pm respectively.

At 8.25am on Thursday, PSI ranged from 66 to 82 — in the moderate range — with central Singapore recording the highest reading of 82.

Meanwhile, one-hour PM2.5 is in the normal band for all five regions, with concentration readings ranging from 16 to 46.

In its daily haze situation update on Wednesday evening, the National Environment Agency (NEA) said the country's 24-hour PSI is forecast to be in the moderate to low-unhealthy range.

This is an improvement from the high-moderate to mid-unhealthy forecast a day earlier.

Smoke haze from southern Sumatra and Kalimantan was observed to have drifted towards Singapore, NEA noted.

Along with the prevailing south-easterly or southerly winds, the risk of smoke haze affecting Singapore remains, it added.

Members of the public are advised to check the one-hour PM2.5 concentration readings before participating in any immediate outdoor activities.

新加坡居民在 10 月 1 日迎来了更加晴朗的天空和改善的空气质量，因为所有五个地区的 24 小时污染物标准指数 (PSI) 都回到了中等水平。

周三晚上 11 点，中部和西部地区的空气质量指数回落至中等水平；而西部和南部地区的空气质量指数分别于晚上 9 点和 6 点脱离了不健康水平。

周四上午 8 点 25 分，新加坡空气污染指数 (PSI) 在 66 到 82 之间，处于中等水平，其中新加坡中部地区读数最高，为 82。

同时，五个地区的 PM2.5 一小时浓度均处于正常范围内，浓度读数在 16 至 46 之间。

国家环境局（NEA）在周三晚间发布的每日雾霾情况更新中表示，该国24小时空气污染指数（PSI）预计将处于中度至轻度不健康范围。

这比前一天预测的高至中等至中等不健康状况有所改善。

新加坡国家环境局指出，来自苏门答腊南部和加里曼丹的烟雾已经飘向新加坡。

报告还指出，由于盛行东南风或南风，烟雾影响新加坡的风险依然存在。

建议公众在参加任何户外活动前，先查看一小时 PM2.5 浓度读数。