Haze update Sept 29: Air quality improves slightly; Singapore's 24-hour PSI forecast to be in high-moderate to low-unhealthy range9月29日雾霾最新消息：空气质量略有改善；新加坡24小时空气污染指数（PSI）预测将处于高至中等至低至不健康范围内。
Singapore's air quality gradually improved throughout Tuesday (Sept 29), with one-hour PM2.5 concentration readings easing into normal to elevated bands, while the 24-hour Pollutant Standards Index (PSI) reading fell.At 6pm, the 24-hour PSI readings for all five regions remained in the unhealthy range, with central Singapore recording the highest reading of 153.Meanwhile, one-hour PM2.5 ranged from 44 to 76 —...
Singapore's air quality gradually improved throughout Tuesday (Sept 29), with one-hour PM2.5 concentration readings easing into normal to elevated bands, while the 24-hour Pollutant Standards Index (PSI) reading fell.
At 6pm, the 24-hour PSI readings for all five regions remained in the unhealthy range , with central Singapore recording the highest reading of 153.
Meanwhile, one-hour PM2.5 ranged from 44 to 76 — in the normal to elevated bands — with only eastern (76) and western (56) Singapore recording concentration readings in the higher of two bands.
The National Environment Agency (NEA) said in its daily haze situation update on Tuesday evening that it expects the country's 24-hour PSI forecast to be in the high-moderate to mid-unhealthy range.
Moderate to dense smoke haze from fires in Kalimantan have continued to drift towards Singapore, while haze was also observed from fires detected in southern Sumatra, NEA explained.
Noting that dry conditions are expected to persist over southern Sumatra and parts of Kalimantan, and the prevailing easterly or south-easterly winds, the agency said there remains a risk of smoke haze affecting Singapore.
Members of the public should note that the health impact of haze is dependent on one’s health status, the PSI level, as well as the length and intensity of outdoor activity.
They are advised to check the one-hour PM2.5 concentration readings prior to any immediate outdoor activities.
新加坡的空气质量在周二（9月29日）逐渐改善，一小时PM2.5浓度读数降至正常至偏高水平，而24小时污染物标准指数（PSI）读数下降。
下午 6 点，新加坡五个地区的 24 小时空气污染指数 (PSI) 读数仍处于不健康范围内，其中新加坡中部地区的读数最高，为 153。
与此同时，一小时 PM2.5 浓度范围为 44 至 76，处于正常至偏高水平区间，只有新加坡东部（76）和西部（56）的浓度读数处于较高水平。
国家环境局（NEA）在周二晚间发布的每日雾霾情况更新中表示，预计该国24小时空气污染指数（PSI）将处于中高至中等不健康水平。
新加坡国家环境局解释说，加里曼丹岛火灾产生的中度至重度烟霾持续向新加坡飘移，同时苏门答腊南部火灾也产生了烟霾。
该机构指出，苏门答腊南部和加里曼丹部分地区预计将持续干燥天气，且盛行东风或东南风，因此新加坡仍有可能受到烟霾影响。
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。
建议他们在进行任何户外活动之前，先查看一小时 PM2.5 浓度读数。