Haze update Oct 4: Air quality improves slightly, 24-hour forecast in high-moderate to low-unhealthy range10月4日雾霾最新消息：空气质量略有改善，未来24小时预报为中高至低不健康范围。
Air quality in the Republic stayed in the moderate range on Sunday (Oct 4) afternoon, after 24-hour Pollutant Standards Index (PSI) readings in central Singapore exited unhealthy levels at 11am. At 6pm, PSI across Singapore ranged from 74 to 97, with central Singapore, with central Singapore recording the highest reading of 97.PSI readings between 51 to 100 denote the moderate...
Air quality in the Republic stayed in the moderate range on Sunday (Oct 4) afternoon, after 24-hour Pollutant Standards Index (PSI) readings in central Singapore exited unhealthy levels at 11am.
At 6pm, PSI across Singapore ranged from 74 to 97, with central Singapore, with central Singapore recording the highest reading of 97.
PSI readings between 51 to 100 denote the moderate range.
Meanwhile, one-hour PM2.5 readings stayed in the normal band in the northern (48), southern (54) and western (42) regions, but readings in eastern (58) and central (83) Singapore are in the elevated band.
In its daily haze situation update on Sunday evening, the National Environment Agency said the country's 24-hour PSI is expected to be in the high-moderate to low-unhealthy range.
It noted that moderate to dense smoke plumes from southern Sumatra have continued to drift towards Singapore and the surrounding region, while smoke haze was also observed from fires in Kalimantan.
Data from the ASEAN Meteorological Centre shows that the number of hotspots in Kalimantan decreased from 232 to 178 on Oct 3, while hotspots in Sumatra fell from 232 to 175.
According to NEA, dry weather is expected over Singapore and the surrounding region on Monday.
This, coupled with the prevailing south-easterly or south-westerly winds, means that there remains a risk of smoke haze affecting Singapore.
Members of the public should check the latest one-hour PM2.5 concentration readings before participating in outdoor activities.
周日（10 月 4 日）下午，新加坡共和国的空气质量保持在中等水平，此前新加坡中部 24 小时污染物标准指数 (PSI) 读数在上午 11 点脱离了不健康水平。
下午 6 点，新加坡各地的 PSI 指数在 74 到 97 之间，其中新加坡中部地区的 PSI 指数最高，达到 97。
PSI读数在51到100之间表示中等范围。
与此同时，新加坡北部（48）、南部（54）和西部（42）地区的一小时 PM2.5 读数保持在正常范围内，但东部（58）和中部（83）地区的读数处于升高范围。
国家环境局在周日晚间发布的每日雾霾情况更新中表示，该国 24 小时 PSI 指数预计将处于高-中度至低-不健康范围内。
报告指出，来自苏门答腊南部的中等至浓重的烟雾持续向新加坡及其周边地区飘移，同时还观测到加里曼丹火灾产生的烟雾。
东盟气象中心的数据显示，10 月 3 日加里曼丹岛的热点数量从 232 个减少到 178 个，而苏门答腊岛的热点数量从 232 个减少到 175 个。
据新加坡国家环境局（NEA）预测，周一新加坡及周边地区天气晴朗干燥。
再加上盛行的东南风或西南风，这意味着新加坡仍然面临烟雾影响的风险。
公众在参加户外活动前，应查看最新的1小时PM2.5浓度读数。