Clearer skies, fresher air as PSI, PM2.5 ease, but smoke haze could return from Oct 20 to 22: NEA

Sun shined brightly, along with clearer skies and fresher air continued into a second day on Monday (Oct 19) amid a favourable wind direction.

Throughout the day, hourly PM2.5 was mostly in the normal band (0 to 55µg/m3) in the northern, eastern and southern regions, with 24-hour Pollutant Standards Index (PSI) in this area also remaining in the good-to-moderate range.

In central and western Singapore, the concentration reading was in the low-elevated band, while PSI dropped towards the low-unhealthy range.

At 6pm, concentration readings ranged from 51 in eastern Singapore to 79 in the central region.

Meanwhile, PSI readings were in the low-unhealthy range in western (114) and central (105) Singapore, but stayed in the good-to-moderate range in southern (88), northern (89) and the eastern (91) regions.

Explaining a second continued day of improved air quality, the National Environment Agency (NEA) said in its daily haze situation update on Monday evening that it is due to the turning of winds to blow from the south-southeast and showers in the vicinity.

But smoke haze from Kalimantan and Sumatra was still observed in the vicinity of Singapore, it added.

PSI and weather 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.

Smoke haze could return from Oct 20 night

Despite the possibility of a three-day stretch of better air quality, the agency warned that Singapore could again experience smoke haze from Tuesday night till Thursday.

This, it said, as 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," it added.

星期一（10 月 19 日），阳光灿烂，天空晴朗，空气清新，风向也十分有利，这样的好天气持续了两天。

全天，北部、东部和南部地区的每小时 PM2.5 浓度大多处于正常范围（0 至 55µg/m3），该地区的 24 小时污染物标准指数 (PSI) 也保持在良好至中等的范围内。

在新加坡中部和西部，浓度读数处于低偏高水平，而 PSI 则下降到低偏不健康范围。

下午 6 点，新加坡东部的浓度读数为 51，中部地区的浓度读数为 79。

与此同时，新加坡西部（114）和中部（105）的PSI读数处于低至不健康范围，而南部（88）、北部（89）和东部（91）地区的PSI读数则处于良好至中等范围。

国家环境局 (NEA) 在周一晚间发布的每日雾霾情况更新中解释说，空气质量连续第二天改善，是因为风向转为东南偏南风，而且附近有阵雨。

报告还指出，新加坡附近仍能观测到来自加里曼丹和苏门答腊的烟雾。

气压和天气预报

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。

10月20日晚间，烟雾可能再次出现。

尽管空气质量有可能连续三天有所改善，但该机构警告称，新加坡可能从周二晚上到周四再次出现烟雾。

报告称，由于预计周边地区（包括加里曼丹部分地区）将出现干燥天气，风向可能会转为东南偏东风。

“这可能会将加里曼丹岛火灾产生的烟雾带到新加坡方向，”声明补充道。