Haze update Sept 17: Singapore air quality remains moderate, 24-hour PSI forecast to reach low unhealthy levels9月17日雾霾最新消息：新加坡空气质量仍为中等，预计24小时空气污染指数（PSI）将达到轻微不健康水平。
Singapore's air quality remained in the moderate range on Thursday (Sept 17), extending the improvement in conditions seen since Wednesday afternoon.Data from the National Environment Agency (NEA) shows that the 24-hour Pollutant Standards Index (PSI) at 6pm stood between 68 and 95 at 6pm — in the moderate range — with the highest reading of 95 recorded in central Singapore.AsiaOne's...
Singapore's air quality remained in the moderate range on Thursday (Sept 17), extending the improvement in conditions seen since Wednesday afternoon.
Data from the National Environment Agency (NEA) shows that the 24-hour Pollutant Standards Index (PSI) at 6pm stood between 68 and 95 at 6pm — in the moderate range — with the highest reading of 95 recorded in central Singapore.
AsiaOne's checks on the 24-hour PSI hourly data show that air quality in central Singapore had been gradually deteriorating since 8am, with PSI readings edging closer to the unhealthy threshold.
Meanwhile, one-hour PM2.5 concentration readings were in the elevated band for three regions at 6pm — central (99), western (66) and southern (58) Singapore.
The two remaining regions recorded one-hour PM2.5 readings in the normal band.
In its daily haze situation update on Thursday evening, NEA said Singapore's 24-hour PSI is forecast to be in the high moderate to low unhealthy range.
Explaining this, NEA said smoke haze was observed to have drifted from southern and central Sumatra towards Singapore during its weather satellite pass at 2.17pm.
Smoke plumes were also detected over southwestern Kalimantan.
"With the prevailing winds forecast to blow from the southeast to southwest, there is a risk of smoke haze affecting Singapore," NEA said
Members of the public are advised to check one-hour PM2.5 concentration readings and the accompanying health guidance when deciding on outdoor activities in the next few hours.
For planning outdoor activities the following day, NEA advised the public to refer to the 24-hour PSI forecast and the corresponding health advisories.
新加坡周四（9月17日）空气质量仍处于中等水平，延续了自周三下午以来空气质量的改善趋势。
国家环境局 (NEA) 的数据显示，下午 6 点的 24 小时污染物标准指数 (PSI) 介于 68 至 95 之间，处于中等范围，其中新加坡中部记录到的最高读数为 95。
AsiaOne 对 24 小时 PSI 小时数据的检查显示，新加坡中部地区的空气质量自早上 8 点以来一直在逐渐恶化，PSI 读数正逼近不健康阈值。
与此同时，下午 6 点，新加坡中部（99）、西部（66）和南部（58）三个地区的 PM2.5 浓度一小时读数处于较高水平。
其余两个地区记录到的一小时 PM2.5 读数处于正常范围内。
新加坡国家环境局（NEA）在周四晚间发布的每日雾霾情况更新中表示，新加坡24小时空气污染指数（PSI）预计将处于较高、中等至较低、不健康的范围内。
新加坡国家环境局解释说，下午 2 点 17 分，气象卫星过境时观测到烟雾从苏门答腊南部和中部向新加坡飘去。
加里曼丹西南部上空也探测到了烟雾。
“由于预计盛行风向将从东南风吹向西南风，新加坡有可能受到烟霾影响，”国家环境局表示。
建议公众在决定未来几小时内进行户外活动时，查看一小时 PM2.5 浓度读数和相关的健康指南。
为方便公众规划第二天的户外活动，国家环境局建议参考 24 小时 PSI 预报和相应的健康建议。