Air quality in Singapore turns unhealthy again, 1-hour PM2.5 elevated across Singapore新加坡空气质量再次恶化，PM2.5 1小时浓度在新加坡各地升高。
Air quality in Singapore returned to the unhealthy range again at noon on Monday (Sept 14) At 12pm, the 24-hour Pollutant Standard Index (PSI) reading in central Singapore was 102. A reading of between 101 and 200 denotes the unhealthy range.Elsewhere in the Republic, 24-hour PSI reading was between 79 and 91, still within the moderate range, with the next...
Air quality in Singapore returned to the unhealthy range again at noon on Monday (Sept 14)
At 12pm, the 24-hour Pollutant Standard Index (PSI) reading in central Singapore was 102. A reading of between 101 and 200 denotes the unhealthy range.
Elsewhere in the Republic, 24-hour PSI reading was between 79 and 91, still within the moderate range, with the next highest reading of 91 recorded in eastern and western Singapore.
Meanwhile, the one-hour PM2.5 — an indicator of fine micro-pollutants in the air — is in the elevated range across the city state.
The highest one-hour PM2.5 reading of 100 was also recorded in central Singapore.
Data from the National Environment Agency (NEA) shows that one-hour PM2.5 hit a high of 113 at 10am on Monday.
AsiaOne had earlier reported that the reading was recorded at 107 in the central region at 9am .
This is also the first instance since Sept 4 that one-hour PM2.5 readings have crossed the mid-range mark. Readings of between 56 and 150 indicate the elevated range.
Why the haze is affecting us again
In its daily haze situation update on Sunday , NEA said Singapore's 24-hour PSI forecast is expected to be in the moderate to low unhealthy range.
Explaining this, NEA stated that moderate to dense smoke plumes continue to be observed from fires in Kalimantan and southern Sumatra.
It has also observed smoke plumes from fires in Kalimantan drifting towards Singapore.
The agency added that while showers are forecast over northern Sumatra and north-western Borneo in the coming days, dry conditions are forecast over Kalimantan and southern Sumatra.
This, coupled with the prevailing southerly or south-easterly winds, means there remains a risk of transboundary smoke haze affecting Singapore, should fires in Indonesia persist.
What to do when air quality is unhealthy
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.
Those who are planning to conduct or participate in outdoor activities immediately can check the 1-hour PM2.5 concentration readings and vulnerable persons guide.
Meanwhile, those who are planning outdoor activities for the next day should use the 24-hour PSI forecast and the corresponding health advisories for planning.
新加坡空气质量于周一（9月14日）中午再次回落至不健康水平。
中午 12 点，新加坡中部 24 小时污染物标准指数 (PSI) 读数为 102。读数在 101 到 200 之间表示不健康范围。
在新加坡共和国其他地区，24 小时 PSI 读数在 79 到 91 之间，仍在中等范围内，新加坡东部和西部记录到的次高读数为 91。
与此同时，整个城市国家的一小时 PM2.5 值（空气中细小污染物的指标）处于较高水平。
新加坡中部地区也记录到了最高的1小时PM2.5读数，达到100。
国家环境局（NEA）的数据显示，周一上午 10 点，PM2.5 一小时浓度达到最高值 113。
亚洲新闻网此前报道称，上午9点，中部地区的读数为107。
这也是自9月4日以来，一小时PM2.5读数首次超过中等水平。读数在56至150之间表示PM2.5浓度处于偏高范围。
为什么雾霾再次影响到我们？
新加坡国家环境局 (NEA) 在周日发布的每日雾霾情况更新中表示，新加坡 24 小时空气污染指数 (PSI) 预计将处于中低不健康范围。
对此，国家环境局表示，加里曼丹岛和苏门答腊南部地区的火灾持续产生中等至浓重的烟雾。
它还观察到加里曼丹岛火灾产生的烟雾飘向新加坡。
该机构补充说，虽然预计未来几天苏门答腊北部和婆罗洲西北部会有阵雨，但加里曼丹和苏门答腊南部预计将出现干燥天气。
再加上盛行的南风或东南风，这意味着如果印度尼西亚的火灾持续下去，跨境烟霾仍可能影响新加坡。
空气质量不健康时该怎么办？
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。
计划立即进行或参与户外活动的人员可以查看 1 小时 PM2.5 浓度读数和易感人群指南。
同时，计划第二天进行户外活动的人们应该参考 24 小时 PSI 预报和相应的健康建议进行规划。