Haze watch: Air quality in Singapore improves overnight, returns to moderate range雾霾预警：新加坡空气质量一夜之间改善，回升至中等水平
Residents in Singapore can breathe easier again after air quality returned to the moderate range overnight.The 24-hour Pollutant Standards Index (PSI) turned unhealthy in central Singapore at 9pm on Thursday night, with about four hours in that range.At 9am on Friday (Sept 18), the 24-hour PSI ranged between 70 and 97 — placing Singapore's overall air quality in the moderate...
Residents in Singapore can breathe easier again after air quality returned to the moderate range overnight.
The 24-hour Pollutant Standards Index (PSI) turned unhealthy in central Singapore at 9pm on Thursday night , with about four hours in that range.
At 9am on Friday (Sept 18), the 24-hour PSI ranged between 70 and 97 — placing Singapore's overall air quality in the moderate range — with the highest PSI of 97 recorded in central Singapore.
The next highest PSI reading of 90 was recorded in western Singapore.
Meanwhile, one-hour PM2.5 at 9am was between 12 and 22, with the highest reading of 22 recorded in central Singapore.
Readings of between 0 and 55 denote the normal band.
Forecast till Friday evening
In its daily haze situation update on Thursday evening , the National Environment Agency (NEA) said the country's 24-hour PSI forecast is expected to be in the high moderate to low unhealthy range.
Explaining this, the agency noted that smoke haze was observed to have drifted from southern and central Sumatra towards Singapore, while smoke plumes were also detected over southwestern Kalimantan.
"With the prevailing winds forecast to blow from the southeast to southwest, there is a risk of smoke haze affecting Singapore," NEA said
Members of the public 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.
They can check the latest one-hour PM2.5 reading if participating in immediate outdoor activities.
新加坡空气质量一夜之间恢复到中等水平，居民们终于可以再次呼吸到更顺畅的空气了。
周四晚上 9 点，新加坡中部地区的 24 小时污染物标准指数 (PSI) 达到不健康水平，其中约有 4 个小时处于该水平。
9 月 18 日星期五上午 9 点，新加坡 24 小时空气污染指数 (PSI) 在 70 到 97 之间，整体空气质量处于中等水平，其中新加坡中部地区记录到的最高 PSI 为 97。
新加坡西部录得第二高的PSI读数为90。
与此同时，上午 9 点的 PM2.5 一小时浓度在 12 到 22 之间，其中新加坡中部地区记录到的最高读数为 22。
读数在 0 到 55 之间表示正常范围。
截至周五晚的天气预报
国家环境局（NEA）在周四晚间发布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、低不健康范围。
该机构解释说，观察到烟雾从苏门答腊南部和中部向新加坡飘移，同时在加里曼丹西南部也检测到了烟雾。
“由于预计盛行风向将从东南风吹向西南风，新加坡有可能受到烟霾影响，”国家环境局表示。
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。
如果参加户外活动，他们可以查看最新的1小时PM2.5读数。