Moderate 24-hour PSI across Singapore on Sept 7 morning, 1-hour PM2.5 in normal range

For the second consecutive morning in Singapore on Monday (Sept 7), air quality over 24 hours has remained in the moderate range — albeit on the higher end of the range.

At 10am, the central region recorded a 24-hour Pollutant Standards Index (PSI) reading of 92.

Meanwhile, 24-hour PSI readings in the northern, eastern, southern and western regions are 68, 86, 78, and 86 respectively.

Air quality hit the unhealthy range of 100 to 200, for the first time since October 2023, last Friday morning — recording a 24-hour Pollutant Standard Index (PSI) reading of 103.

During that period, 1-hour PM2.5 readings in the central and eastern regions also hit the elevated range.

But the situation improved from Saturday night, with data from the National Environment Agency's (NEA) haze microsite showing that 24-hour PSI readings fell back below the unhealthy range from about 9pm on Saturday.

It has stayed that way since, for now, despite both the central and eastern regions recording elevated 1-hour PM2.5 readings through Sunday evening.

In its daily update on Sunday , NEA forecast Singapore's 24-hour PSI to remain within the high moderate to low unhealthy range .

It also cautioned that Singapore faces a continued risk of transboundary smoke haze should the fires in southern and central Sumatra, as well as West Kalimantan, continue.

Members of the public should note that the health impact of haze is dependent on one's health status, the PSI level, and the length and intensity of outdoor activity.

Those who are planning to conduct or participate in outdoor activities immediately can check the 1-hour PM2.5 concentration readings and vulnerable persons guide.

Meanwhile, those who are planning outdoor activities for the next day should use the 24-hour PSI forecast and the corresponding health advisories for planning.

周一（9月7日）新加坡连续第二个早晨，24小时空气质量保持在中等水平——尽管处于该水平的较高范围。

上午 10 点，中部地区 24 小时污染物标准指数 (PSI) 读数为 92。

与此同时，北部、东部、南部和西部地区的 24 小时 PSI 读数分别为 68、86、78 和 86。

上周五早上，空气质量首次达到 100 至 200 的不健康范围，这是自 2023 年 10 月以来的首次——24 小时污染物标准指数 (PSI) 读数为 103。

在此期间，中部和东部地区的 1 小时 PM2.5 读数也达到了较高水平。

但从周六晚上开始情况有所好转，国家环境局 (NEA) 的雾霾微网站数据显示，从周六晚上 9 点左右开始，24 小时 PSI 读数已回落到不健康范围以下。

尽管截至周日晚间，中部和东部地区的 1 小时 PM2.5 读数均有所升高，但这种情况目前仍未改变。

新加坡国家环境局 (NEA) 在周日发布的每日更新报告中预测，新加坡 24 小时 PSI 指数将保持在较高、中等到较低、不健康的范围内。

报告还警告说，如果苏门答腊南部和中部以及西加里曼丹的火灾持续下去，新加坡将面临跨境烟霾的持续风险。

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。

计划立即进行或参与户外活动的人员可以查看 1 小时 PM2.5 浓度读数和易感人群指南。

同时，计划第二天进行户外活动的人们应该参考 24 小时 PSI 预报和相应的健康建议进行规划。