Haze watch: Air quality improves, PSI returns to moderate levels across Singapore

Air quality in the Republic improved on Sunday (Oct 4) morning as 24-hour Pollutant Standards Index (PSI) in central Singapore returned to the moderate range.

It entered the unhealthy range at 11am on Saturday.

At 10am on Sunday, PSI readings across Singapore ranged from 76 to 99 — in the moderate range. The highest reading of 99 was recorded in the central region.

Meanwhile one-hour PM2.5, an indicator of fine particulate matter in the air, ranged between 15 and 44. Concentration readings from 0 to 55 denote the normal band.

In its daily haze situation update on Saturday evening , the National Environment Agency (NEA) said the country's 24-hour PSI is forecast to be in the high-moderate to low-unhealthy range.

It noted that moderate to dense smoke plumes from southern Sumatra were observed drifting towards Singapore and 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.

Given that dry weather conditions are expected to persist over Singapore and the surrounding region on Sunday, and with prevailing south-easterly or south-westerly winds, there remains a risk of smoke haze affecting Singapore, NEA said.

Members of the public should check the latest one-hour PM2.5 concentration readings before engaging in outdoor activities.

周日（10 月 4 日）上午，新加坡中部 24 小时污染物标准指数 (PSI) 回升至中等水平，共和国空气质量有所改善。

周六上午 11 点，气温降至不健康水平。

周日上午10点，新加坡各地空气污染指数（PSI）读数在76至99之间，属于中等水平。中部地区录得最高读数99。

同时，一小时 PM2.5（空气中细颗粒物的指标）的范围在 15 到 44 之间。浓度读数在 0 到 55 之间表示正常范围。

国家环境局（NEA）在周六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-中度至低-不健康范围内。

报告指出，从苏门答腊南部观测到中等至浓重的烟柱向新加坡及周边地区飘移，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。

新加坡国家环境局表示，鉴于预计周日新加坡及其周边地区将持续干燥天气，且盛行东南风或西南风，新加坡仍有可能受到烟霾影响。

公众在进行户外活动前，应查看最新的1小时PM2.5浓度读数。