Haze update Sept 20: Air quality in central Singapore remains moderate, 24-hour PSI forecast moderate to low-unhealthy9月20日雾霾最新消息：新加坡中部空气质量仍为中等，24小时空气污染指数（PSI）预测为中等至轻微不健康。
Air quality in Singapore has improved throughout Sunday (Sept 20), with only central Singapore recording a 24-hour Pollutant Standards Index (PSI) reading in the unhealthy range at 6pm. Earlier on Sunday, the eastern and western regions joined central Singapore in that range before returning to the moderate range at 9am and 12pm respectively.At 6pm, PSI ranged from 71 to 102...
Air quality in Singapore has improved throughout Sunday (Sept 20), with only central Singapore recording a 24-hour Pollutant Standards Index (PSI) reading in the unhealthy range at 6pm.
Earlier on Sunday, the eastern and western regions joined central Singapore in that range before returning to the moderate range at 9am and 12pm respectively.
At 6pm, PSI ranged from 71 to 102 — in the moderate to unhealthy range — with central Singapore recording the highest reading of 102.
Meanwhile, the one-hour PM2.5 is in the normal band for all regions except for central Singapore, which has a concentration reading of 60µg/m3 — in the elevated band.
In its daily haze update on Sunday evening, the National Environment Agency (NEA) said the country's 24-hour PSI forecast is expected to remain in the moderate to low-unhealthy range due to the prevailing winds blowing from the southeast, which has brought smoke haze from Sumatra to Singapore.
It also noted that moderate to dense smoke plumes were observed from fires in Kalimantan.
"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 .
新加坡的空气质量在周日（9 月 20 日）有所改善，只有新加坡中部地区在下午 6 点的 24 小时污染物标准指数 (PSI) 读数处于不健康范围。
周日早些时候，东部和西部地区与新加坡中部地区一样进入了该范围，之后分别在上午 9 点和中午 12 点恢复到中等范围。
下午 6 点，PSI 指数在 71 到 102 之间，处于中度至不健康范围内，其中新加坡中部地区读数最高，为 102。
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 60µg/m3，处于偏高范围。
新加坡国家环境局 (NEA) 在周日晚间的每日雾霾更新中表示，由于盛行的东南风将苏门答腊的烟霾带到了新加坡，预计该国 24 小时空气污染指数 (PSI) 将继续处于中度至轻度不健康范围内。
报告还指出，加里曼丹岛的火灾产生了中等至浓密的烟雾。
“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。