Haze update Sept 19: Air quality turns unhealthy in central Singapore; 24-hour PSI forecast in high-moderate to mid-unhealthy range9月19日雾霾最新消息：新加坡中部空气质量转为不健康；24小时空气污染指数（PSI）预计处于中高至中等不健康范围。
Air quality in the Republic worsened on Saturday (Sept 19) afternoon as the 24-hour Pollutant Standards Index (PSI) in central Singapore entered the unhealthy range at 1pm.One-hour PM2.5 in the central region also bordered the high-band at 12pm, hitting a high of 149 µg/m3. Readings between 56 and 150 are in the elevated band.At 6pm, the 24-hour PSI reading ranged...
Air quality in the Republic worsened on Saturday (Sept 19) afternoon as the 24-hour Pollutant Standards Index (PSI) in central Singapore entered the unhealthy range at 1pm .
One-hour PM2.5 in the central region also bordered the high-band at 12pm, hitting a high of 149 µg/m3. Readings between 56 and 150 are in the elevated band.
At 6pm, the 24-hour PSI reading ranged from 83 to 108. This is in the moderate to unhealthy range.
The highest PSI reading of 108 was recorded in central Singapore, while the next highest readings were in eastern (93) and western (96) Singapore.
Meanwhile, one-hour PM2.5 is in the normal band for all regions, except in central Singapore, where the concentration reading is 61.
In its daily haze update on Saturday evening, the National Environment Agency (NEA) said the country's 24-hour PSI forecast is expected to remain in the high-moderate to mid-unhealthy range.
This is due to prevailing winds blowing from the east-southeast or southeast, which has brought smoke plumes from fires in Kalimantan and southern Sumatra towards Singapore, the agency explained.
"There is a risk of smoke haze affecting Singapore," NEA added.
Members of the public can refer to the one-hour PM2.5 reading if planning to participate in outdoor activities immediately, or the 24-hour PSI forecast for next-day activities.
They 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.
editor@asiaone.com .
9 月 19 日星期六下午，新加坡空气质量恶化，新加坡中部 24 小时污染物标准指数 (PSI) 于下午 1 点进入不健康范围。
中心区域的一小时 PM2.5 浓度在中午 12 点也接近高值区，最高达到 149 µg/m3。读数在 56 到 150 之间属于高值区。
下午 6 点，24 小时 PSI 读数在 83 到 108 之间。这属于中度至不健康范围。
新加坡中部记录到的最高 PSI 读数为 108，其次是新加坡东部（93）和西部（96）。
与此同时，除新加坡中部地区外，所有地区的 PM2.5 一小时浓度均处于正常范围内，而新加坡中部地区的浓度读数为 61。
国家环境局（NEA）在周六晚间发布的每日雾霾更新报告中表示，该国24小时空气污染指数（PSI）预计将保持在中高至中等不健康水平。
该机构解释说，这是由于盛行的东南风或东南风将加里曼丹岛和苏门答腊岛南部火灾产生的烟雾吹向新加坡所致。
“烟雾有可能影响新加坡，”国家环境局补充道。
公众如计划立即参加户外活动，可参考一小时 PM2.5 读数；如计划参加次日活动，可参考 24 小时 PSI 预报。
他们应该注意到，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。
editor@asiaone.com。