Haze watch: Air quality in Singapore deteriorates, central region PSI turns unhealthy

The 24-hour Pollutant Standards Index (PSI) returned to the unhealthy range in central Singapore on Saturday (Oct 3) morning, after two consecutive days of improved air quality .

At 11am, PSI ranged from 76 to 102 — in the moderate to unhealthy range — with central Singapore recording the highest PSI of 102.

Elsewhere, the eastern and western regions have the next highest readings of 94 and 91 respectively. PSI readings of between 101 to 200 are in the unhealthy range.

Meanwhile, one-hour PM2.5 is in the elevated band in eastern (66), and central (63) Singapore.

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

It noted that moderate to dense smoke plumes from southern Sumatra were observed drifting towards Singapore, while smoke haze was also observed from fires in Kalimantan.

Given that dry weather is forecast in Singapore and the surrounding region on Saturday, coupled with the prevailing south-easterly or southerly winds, the agency added that smoke haze could be transported towards Singapore.

Members of the public should check the latest one-hour PM2.5 concentration readings before engaging in outdoor activities.

新加坡中部地区24小时污染物标准指数（PSI）在连续两天空气质量改善后，于周六（10月3日）上午再次回到不健康范围。

上午 11 点，PSI 指数在 76 到 102 之间，处于中度至不健康范围内，其中新加坡中部地区的 PSI 指数最高，达到 102。

其他地区中，东部和西部地区的读数分别高达94和91。PSI读数在101到200之间属于不健康范围。

与此同时，新加坡东部（66）和中部（63）的 PM2.5 一小时浓度处于较高水平。

国家环境局（NEA）在周五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）预计将保持在中等至轻微不健康范围内。

报告指出，从苏门答腊南部观测到中等至浓重的烟柱向新加坡飘去，同时还观测到加里曼丹火灾产生的烟霾。

鉴于新加坡及周边地区周六预计天气干燥，加上盛行东南风或南风，该机构补充说，烟雾可能会被输送到新加坡。

公众在进行户外活动前，应查看最新的1小时PM2.5浓度读数。