Haze update Sept 16: Singapore's air quality forecast to range from moderate to low unhealthy

Showers over parts of Kalimantan, where hotspots have been detected, contributed to improvements to Singapore's air quality on Wednesday (Sept 16), although haze risks remain.

Data from the National Environment Agency (NEA) showed that 24-hour Pollutant Standards Index (PSI) at 11am was in the moderate range for all regions in the city state.

At 5pm, 24-hour PSI was between 71 and 89, with central Singapore recording the highest reading of 89. Readings of between 51 to 100 denote moderate air quality.

Meanwhile, one-hour PM2.5 concentrations — an indicator of fine particulate matter in the air and a measure of current air quality — is in the normal band for all regions except for central Singapore, which has a concentration reading of 59.

PM2.5 readings of between 56 to 150 are in the elevated band.

In its daily haze situation update on Wednesday evening, NEA said it expects Singapore's 24-hour PSI forecast to remain in the moderate to low unhealthy range over the next 24 hours.

Explaining this, the agency noted that its weather satellite pass at 1.41pm showed that some smoke haze was observed to have drifted from the southern parts of Sumatra towards Singapore.

This, coupled with prevailing winds forecast to blow from the southeast or south, means that some risk of haze affecting Singapore remains.

Members of the public should note that the health impact of haze depends on one’s health status, the PSI level, and the length and intensity of outdoor activity.

For immediate outdoor activities, the public should check the 1-hour PM2.5 concentration readings and corresponding health guidance. For planning outdoor activities for the next day, they should refer to the 24-hour PSI forecast and relevant health advisories.

周三（9月16日），加里曼丹部分地区（已发现热点地区）的降雨改善了新加坡的空气质量，但雾霾风险仍然存在。

国家环境局 (NEA) 的数据显示，上午 11 点的 24 小时污染物标准指数 (PSI) 在新加坡所有地区均处于中等水平。

下午 5 点，24 小时空气污染指数 (PSI) 在 71 至 89 之间，其中新加坡中部地区读数最高，为 89。读数在 51 至 100 之间表示空气质量中等。

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（空气中细颗粒物的指标，也是衡量当前空气质量的指标）均处于正常范围内，而新加坡中部地区的浓度读数为 59。

PM2.5 读数在 56 至 150 之间属于高浓度范围。

新加坡国家环境局 (NEA) 在周三晚间发布的每日雾霾情况更新中表示，预计未来 24 小时内，新加坡的 24 小时空气污染指数 (PSI) 将保持在中低不健康范围内。

该机构解释说，其气象卫星在下午 1 点 41 分的过境观测显示，一些烟雾从苏门答腊南部向新加坡方向飘移。

再加上预计盛行风向将来自东南或南方，这意味着新加坡仍存在受到雾霾影响的风险。

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。

对于近期计划进行的户外活动，公众应查看1小时PM2.5浓度读数及相应的健康指南。对于次日的户外活动计划，公众应参考24小时空气质量指数（PSI）预报及相关的健康建议。