Haze watch: Air quality returns to unhealthy range in central, southern Singapore

Air quality slipped back into the unhealthy range in central and southern Singapore on Monday (Sept 28) evening.

At 8pm, the 24-hour Pollutant Standards Index (PSI) readings ranged from 73 to 104 — in the moderate to unhealthy range — with southern (103) and central (104) Singapore recording the highest PSI readings.

Meanwhile, one-hour PM2.5 is in the elevated band in all five regions, with central Singapore seeing the highest concentration reading of 149. Readings between 56 and 150 denote the elevated band, while a reading between 151 and 250 is in the high band.

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

The agency noted that moderate to dense smoke haze from fires in southern Sumatra and Kalimantan had drifted to Singapore.

With prevailing winds expected to blow from the east or southeast, there remains a risk of smoke haze continuing to affect Singapore, NEA explained.

Members of the public should note that the health impact of haze depends on an individual's health status, the PSI level, as well as the duration and intensity of outdoor activities.

Those planning outdoor activities in the next few hours are advised to check the one-hour PM2.5 readings, while the 24-hour PSI forecast should be used when planning activities for the following day.

周一（9月28日）晚间，新加坡中部和南部地区的空气质量再次降至不健康水平。

晚上 8 点，24 小时污染物标准指数 (PSI) 读数在 73 到 104 之间——处于中等到不健康范围内——其中新加坡南部 (103) 和中部 (104) 的 PSI 读数最高。

与此同时，新加坡所有五个地区的PM2.5一小时浓度均处于较高水平，其中新加坡中部地区的浓度读数最高，达到149。读数在56至150之间表示处于较高水平，而读数在151至250之间则表示处于较高水平。

国家环境局（NEA）在周一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）预计将处于高至中等至中度不健康范围。

该机构指出，来自苏门答腊南部和加里曼丹火灾的中等至浓重烟雾已经飘到了新加坡。

新加坡国家环境局解释说，由于预计盛行风向将来自东部或东南部，烟雾仍可能继续影响新加坡。

公众应注意，雾霾对健康的影响取决于个人的健康状况、PSI 值以及户外活动的持续时间和强度。

计划在接下来的几个小时内进行户外活动的人们，建议查看一小时 PM2.5 读数；而计划第二天活动时，则应使用 24 小时 PSI 预报。