Haze watch Oct 20: PM2.5 mostly low-elevated, but haze could return tonight10月20日雾霾预警：PM2.5浓度主要处于低位，但今晚雾霾可能再次出现。
Residents in Singapore enjoyed a third consecutive day of better air quality on Tuesday (Oct 20) morning, with hourly PM2.5 mostly in the lower-end of the elevated band (56 to 150µg/m3).The current spell, which has seen concentration readings remain in the normal to low-elevated band and 24-hour Pollutant Standards Index (PSI) in the good-to-moderate to low-unhealthy range, is due to...
Residents in Singapore enjoyed a third consecutive day of better air quality on Tuesday (Oct 20) morning, with hourly PM2.5 mostly in the lower-end of the elevated band (56 to 150µg/m3).
The current spell, which has seen concentration readings remain in the normal to low-elevated band and 24-hour Pollutant Standards Index (PSI) in the good-to-moderate to low-unhealthy range, is due to the turning of winds to blow from the south-southeast and showers in the vicinity.
But some haze from Kalimantan and Sumatra was still observed in the vicinity of Singapore, said the National Environment Agency in its daily haze situation update on Monday evening .
At 9am on Tuesday, the one-hour PM2.5 was in the normal band in the northern (44µg/m3) region. It is in the low-elevated band in southern (58), eastern (62), central (78) and western (84) Singapore.
Meanwhile, PSI is in the good-to-moderate range (PSI 0 to 100) in the northern (89), southern (97) and eastern (98) regions, while remaining in the low-unhealthy range in central (114) and western (125) Singapore.
Weather and haze forecast
Residents in Singapore can expect showers over Singapore and the surrounding region on Tuesday.
Under the influence of south-southeasterly winds, the smoke haze from Kalimantan to Singapore may again be reduced, but smoke haze from Sumatra may still drift towards Singapore, NEA stated.
It added that from Tuesday night, winds are likely to turn east-southeasterly with dry conditions forecast over the surrounding region, including parts of Kalimantan.
"This may bring smoke haze from fires in Kalimantan towards Singapore," NEA said, adding that the situation is forecast to last till Thursday.
The Republic's PSI forecast is 90 to 160 — in the moderate to unhealthy range.
周二（10 月 20 日）上午，新加坡居民连续第三天享受到较好的空气质量，每小时 PM2.5 浓度大多处于较高水平的较低范围（56 至 150µg/m3）。
目前，空气浓度读数保持在正常至低偏高水平，24 小时污染物标准指数 (PSI) 处于良好至中等至低不健康范围内，这是由于风向转为东南偏南风，以及附近地区有阵雨所致。
但新加坡国家环境局周一晚间发布的每日雾霾情况更新报告显示，新加坡附近仍观测到来自加里曼丹和苏门答腊的一些雾霾。
周二上午9点，新加坡北部地区一小时PM2.5浓度处于正常范围（44微克/立方米）。南部（58）、东部（62）、中部（78）和西部（84）地区的PM2.5浓度则处于低偏高范围。
与此同时，新加坡北部（89）、南部（97）和东部（98）地区的 PSI 指数处于良好至中等水平（PSI 0 至 100），而中部（114）和西部（125）地区的 PSI 指数仍处于低至不健康水平。
天气和雾霾预报
新加坡居民预计周二新加坡及周边地区将有阵雨。
新加坡国家环境局表示，受东南偏南风的影响，从加里曼丹到新加坡的烟霾可能会再次减少，但来自苏门答腊的烟霾仍可能向新加坡飘移。
声明还补充说，从周二晚上开始，风向可能会转为东南偏东风，预计周边地区（包括加里曼丹岛部分地区）将出现干燥天气。
“这可能会将加里曼丹岛火灾产生的烟雾带到新加坡，”新加坡国家环境局表示，并补充说，这种情况预计将持续到周四。
该共和国预测 PSI 指数为 90 至 160——处于中度至不健康范围。