Haze update Oct 17: Rain keeps air quality from worsening, 24-hour PSI forecast unhealthy to very unhealthy10月17日雾霾最新消息：降雨使空气质量未见恶化，24小时空气污染指数（PSI）预测为不健康至非常不健康。
Afternoon showers over parts of Singapore helped keep hourly PM2.5 from climbing into the very high band on Saturday (Oct 17) afternoon.The western concentration reading, which had stayed in the elevated band for 18 hours, had soared from 111 to 158µg/m3 at 11am. It then hit a high of 243µg/m3 at 2pm, before thundery showers possibly kept it from crossing...
Afternoon showers over parts of Singapore helped keep hourly PM2.5 from climbing into the very high band on Saturday (Oct 17) afternoon.
The western concentration reading, which had stayed in the elevated band for 18 hours, had soared from 111 to 158µg/m3 at 11am.
It then hit a high of 243µg/m3 at 2pm, before thundery showers possibly kept it from crossing into very high band (>251µg/m3).
At 7pm, the hourly concentration reading is in the high band in the southern (156µg/m3), central (182µg/m3), and western (198µg/m3) regions.
Elsewhere, PM2.5 is in the elevated band in the eastern (139µg/m3) and northern (106µg/m3) regions.
The 24-hour Pollutant Standards Index (PSI) is in the unhealthy range, with readings ranging from 130 in northern Singapore to 199 in the western region.
According to the National Environment Agency (NEA), smoke hazes from fires in Kalimantan had continued to drift towards Singapore under the influence of south-easterly winds, while smoke haze was also observed over Sumatra.
Turning to Oct 18, the agency said in its daily haze situation update on Saturday evening that the 24-hour PSI forecast is between 150 and 220 — in the unhealthy to very unhealthy range.
Showers are also expected over Singapore and the surrounding region on Sunday, and with winds forecast to shift to blow from the south-southeast or south, NEA said that there could be a reduction in smoke haze from Kalimantan to Singapore.
However, some smoke haze from Sumatra may drift towards Singapore, it added.
In the first two days of the coming week, more showers are forecast over Singapore and parts of Kalimantan and winds expected to gradually weaken and blow from the southeast or south.
"This could further decrease the transport of smoke haze from Kalimantan to Singapore, although some smoke haze from Sumatra may drift towards Singapore," NEA said.
Members of the public should check the latest PM2.5 concentration readings before participating in any outdoor activities.
周六（10 月 17 日）下午，新加坡部分地区午后阵雨，使得每小时 PM2.5 浓度没有升至极高水平。
西部地区的浓度读数在高位区间持续了 18 个小时，上午 11 点从 111 微克/立方米飙升至 158 微克/立方米。
下午 2 点，浓度达到 243µg/m3 的峰值，之后雷阵雨可能阻止了浓度进入极高水平（>251µg/m3）。
晚上 7 点，南部（156µg/m3）、中部（182µg/m3）和西部（198µg/m3）地区的每小时浓度读数处于高位。
其他地方，东部地区（139µg/m3）和北部地区（106µg/m3）的 PM2.5 浓度处于较高水平。
24 小时污染物标准指数 (PSI) 处于不健康范围，读数从新加坡北部的 130 到西部地区的 199 不等。
据国家环境局（NEA）称，加里曼丹岛火灾产生的烟雾在东南风的影响下继续向新加坡飘移，同时苏门答腊岛上空也观测到了烟雾。
10 月 18 日，该机构在周六晚间的每日雾霾情况更新中表示，24 小时 PSI 预测值在 150 到 220 之间——处于不健康到非常不健康的范围内。
预计周日新加坡及其周边地区也将有阵雨，风向预计将转为东南偏南或正南风，国家环境局表示，加里曼丹到新加坡的烟霾可能会减少。
报告还指出，苏门答腊岛的一些烟雾可能会飘向新加坡。
下周前两天，新加坡和加里曼丹部分地区预计将有更多阵雨，风力预计将逐渐减弱，并转为东南风或南风。
“这可能会进一步减少加里曼丹岛向新加坡输送的烟霾，尽管苏门答腊岛的一些烟霾可能会飘向新加坡，”新加坡国家环境局表示。
公众在参加任何户外活动前，应查看最新的PM2.5浓度读数。