Haze update for Sept 6: 24-hour PSI expected to remain in moderate to unhealthy range

Singapore's 24-hour Pollutant Standard Index (PSI) is expected to remain within the high moderate to low unhealthy range, the National Environment Agency (NEA) said in its daily update on Sunday (Sept 6).

Air quality in Singapore improved overnight , with a 24-hour Pollutant Standard Index (PSI) reading of 87 recorded in the central region at 10am on Sunday (Sept 6) morning, and continued through the day.

Data from NEA's haze microsite shows that air quality in the central region began falling below the unhealthy range at about 9pm on Saturday.

This, after 24-hour PSI entered into the unhealthy range for the first time since Oct 8, 2023, on Friday morning, prompting the agency to begin providing daily updates .

NEA noted in its Sunday update that with the ongoing dry conditions, moderate to dense smoke plumes from fires in southern and central Sumatra as West Kalimantan have continued to drift towards Singapore.

It added that although some showers are forecast over Kalimantan, dry conditions are still expected over Singapore and the surrounding region over the coming days.

"With prevailing winds blowing from the southeast or south, there is a continued risk of smoke haze affecting Singapore should the fires persist."

NEA said that the 24-hour PSI for Singapore is forecast to be in the higher end of the moderate to the lower end of the unhealthy range.

Checks on NEA's haze microsite at 6pm indicate that the 24-hour PSI reading is in the moderate range for all regions in Singapore.

However, 1-hour PM2.5 readings for central and east regions crossed back into the elevated range at 6pm.

NEA said that the health impact of haze is dependent on one's health status, the PSI level, and the length and intensity of outdoor activity.

It advised those who are planning to conduct or participate in outdoor activities now to 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.

新加坡国家环境局 (NEA) 在周日（9 月 6 日）的每日更新中表示，新加坡 24 小时污染物标准指数 (PSI) 预计将保持在高、中、低不健康范围内。

新加坡的空气质量一夜之间有所改善，周日（9月6日）上午10点，中部地区的24小时污染物标准指数（PSI）读数为87，并且这一改善趋势持续了一整天。

新加坡国家环境局雾霾微网站的数据显示，周六晚上9点左右，中部地区的空气质量开始降至不健康范围以下。

此前，24 小时 PSI 指数自 2023 年 10 月 8 日以来首次于周五上午进入不健康范围，促使该机构开始提供每日更新。

新加坡国家环境局在周日的最新通报中指出，由于持续的干燥天气，来自苏门答腊南部和中部以及西加里曼丹火灾产生的中等至浓烟持续向新加坡飘移。

报告还指出，虽然预计加里曼丹岛会有一些阵雨，但未来几天新加坡及周边地区仍将保持干燥天气。

“由于盛行风向为东南风或南风，如果火势持续，新加坡仍有可能受到烟霾影响。”

新加坡国家环境局表示，预计新加坡24小时空气污染指数将处于中等偏高水平至不健康水平的低端。

下午 6 点，新加坡国家环境局雾霾微网站的数据显示，新加坡所有地区的 24 小时 PSI 读数均处于中等水平。

然而，下午 6 点，中部和东部地区的 1 小时 PM2.5 读数再次进入高位范围。

新加坡国家环境局表示，雾霾对健康的影响取决于个人的健康状况、空气污染指数（PSI）以及户外活动的持续时间和强度。

它建议计划进行或参与户外活动的人们查看 1 小时 PM2.5 浓度读数和弱势群体指南。

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。