Haze update Sept 28: Air quality deteriorates, 24-hour PSI forecast to reach mid-unhealthy range

Air quality in Singapore deteriorated through Monday (Sept 28) afternoon, with the 24-hour Pollutant Standards Index (PSI) edging closer to the Unhealthy range in parts of the island, particularly in the south and central regions.

At 6pm, the 24-hour PSI ranged from 68 to 94, remaining in the Moderate range, with the highest reading of 94 recorded in southern Singapore.

Meanwhile, the one-hour PM2.5 readings were in the Elevated band across all five regions.

Central Singapore recorded the highest concentration reading of 138, with southern (115) and western (106) Singapore recording the next highest numbers.

In its daily haze situation update on Monday evening, the National Environment Agency (NEA) said the country's 24-hour PSI is forecast to be in the high-Moderate to mid-Unhealthy range.

Explaining this, the agency noted that moderate to dense smoke haze from fires in southern Sumatra and Kalimantan had drifted to Singapore.

With prevailing winds expected to blow from the east or southeast, there remains a risk of smoke haze continuing to affect Singapore, NEA added.

Members of the public should note that the health impact of haze depends on an individual's health status, the PSI level, and the duration and intensity of outdoor activities.

Those planning outdoor activities in the next few hours are advised to check the one-hour PM2.5 readings, while the 24-hour PSI forecast should be used when planning activities for the following day.

新加坡的空气质量在周一（9月28日）下午持续恶化，岛上部分地区，特别是南部和中部地区的24小时污染物标准指数（PSI）逐渐接近不健康范围。

下午 6 点，24 小时 PSI 指数在 68 到 94 之间，仍处于中等范围，其中新加坡南部记录到的最高读数为 94。

与此同时，所有五个地区的 PM2.5 一小时读数均处于高水平。

新加坡中部地区记录到的最高浓度读数为 138，其次是新加坡南部（115）和西部（106）。

国家环境局（NEA）在周一晚间的每日雾霾情况更新中表示，该国24小时空气污染指数（PSI）预计将处于高-中度至中度-不健康范围内。

该机构解释说，来自苏门答腊南部和加里曼丹火灾的中等至浓重的烟雾已经飘到了新加坡。

新加坡国家环境局补充说，由于预计盛行风向将来自东部或东南部，烟雾仍可能继续影响新加坡。

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。

计划在接下来的几个小时内进行户外活动的人们，建议查看一小时 PM2.5 读数；而计划第二天活动时，则应使用 24 小时 PSI 预报。