新加坡中区空气周六上午跨入“不健康”：24小时PSI升至105，其余四区仍属适中
新加坡——10月3日星期六上午11时，新加坡中区的空气质量跨入“不健康”范围，其余四区仍处于适中水平。下午1时，中区的24小时污染指数（PSI）升至105；东区96、西区93、南区87、北区77。中区的1小时PM2.5读数同时处于偏高带。
最新读数之前，国家环境局（NEA）已在周五晚间发出提示：在盛行东南风或南风下，来自苏门答腊南部的中到浓密烟羽正向新加坡漂移，加里曼丹的火灾也产生烟霾。新加坡和周边地区周六维持干燥天气，环境局此前预测24小时PSI将处于适中到低度不健康范围——周六中区的读数正是落在了这个区间的上沿。
24小时PSI是新加坡的每日空气质量总指标，也是环境局每日健康提示的依据，由PM2.5、PM10、臭氧、二氧化硫、二氧化氮和一氧化碳六种污染物计算，反映过去24小时的平均空气质量。1小时PM2.5读数则反映即时状况，是烟霾期间对健康危害最大的细颗粒物指标。PSI在101至200之间为“不健康”，201至300为“非常不健康”，300以上为“危险”。
环境局依据PSI区间发布分人群的活动指引：空气处于不健康范围时，健康人群应减少长时间或剧烈的户外活动，老人、儿童、孕妇以及患有慢性肺病或心脏病的人应尽量减少或避免这类活动。烟霾何时缓解，取决于印尼火点与风向的变化；环境局每日更新监测与预报。
来源：据Business Today 2026年10月3日引述新加坡国家环境局数据的报道及气象署烟霾更新整理。
Central Singapore's Air Crosses into 'Unhealthy' on Saturday Morning as 24-Hour PSI Hits 105
SINGAPORE — Air quality in central Singapore crossed into the unhealthy range at 11 a.m. on Saturday, October 3, while readings in the other four regions remained moderate. By 1 p.m., the central region's 24-hour Pollutant Standards Index (PSI) had risen to 105, with the east at 96, the west at 93, the south at 87 and the north at 77. The 1-hour PM2.5 reading in the central region was in the elevated band at the same time.
The latest readings followed the National Environment Agency's (NEA) advisory on Friday evening that moderate to dense smoke plumes from southern Sumatra were drifting towards Singapore under southeasterly or southerly winds, with smoke haze also observed from fires in Kalimantan. Dry conditions persisted over Singapore and the surrounding region on Saturday, and the NEA had forecast the 24-hour PSI in the moderate to low-unhealthy range — Saturday's central reading landed at the top of that range.
The 24-hour PSI is Singapore's headline daily air-quality indicator and the basis of the NEA's daily health advisories. It is calculated from six pollutants — PM2.5, PM10, ozone, sulphur dioxide, nitrogen dioxide and carbon monoxide — and reflects the average air quality of the past 24 hours. The 1-hour PM2.5 reading reflects conditions at a point in time; PM2.5, fine particulate matter 2.5 micrometres or smaller, is the dominant pollutant during haze. A 24-hour PSI of 101–200 is 'unhealthy', 201–300 'very unhealthy', and above 300 'hazardous'.
The NEA's advisories by PSI band say that when air is in the unhealthy range, healthy people should reduce prolonged or strenuous outdoor exertion, while the elderly, children, pregnant women and those with chronic lung or heart diseases should minimise or avoid it. How soon the haze eases depends on the fires in Indonesia and on the wind; the agency updates its monitoring and forecasts daily.
Sources: Compiled from Business Today's October 3, 2026 report citing NEA data, and Meteorological Service Singapore haze updates.
图片来源：新加坡武吉知马一带烟霾中的太阳，Sgconlaw 摄，CC BY-SA 4.0（Wikimedia Commons）
