Haze watch: Singapore starts week with better air quality, PSI remains in moderate range

Singapore kicked off the new week with improved air quality as 24-hour Pollutant Standards Index (PSI) stayed in the moderate range for all regions across Singapore on Monday (Sept 21) morning.

The central region, which recorded unhealthy air quality since 1pm on Saturday, returned to the moderate range at 7pm on Sunday.

At 10am on Monday, the PSI ranged from 68 to 86, in the moderate range.

Meanwhile, one-hour PM2.5 concentration reading is between 26 and 41. This is in the normal band.

In its daily haze update on Sunday evening, the National Environment Agency said the country's 24-hour PSI forecast is expected to remain in the moderate to low-unhealthy range.

This is due to the prevailing winds blowing from the southeast, which has brought smoke haze from Sumatra to Singapore.

It also noted that moderate to dense smoke plumes were observed from fires in Kalimantan.

"There is a risk of smoke haze affecting Singapore," NEA added.

Members of the public can refer to the one-hour PM2.5 reading if planning to participate in outdoor activities immediately, or the 24-hour PSI forecast for next-day activities.

They 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.

新加坡在新的一周伊始空气质量有所改善，周一（9月21日）上午，新加坡所有地区的24小时污染物标准指数（PSI）均保持在中等水平。

中部地区自周六下午 1 点起空气质量为不健康，周日晚上 7 点恢复到中等水平。

周一上午 10 点，PSI 指数在 68 到 86 之间，处于中等水平。

同时，一小时 PM2.5 浓度读数在 26 至 41 之间。这属于正常范围。

国家环境局在周日晚间发布的每日雾霾更新报告中表示，该国24小时空气污染指数（PSI）预计将保持在中度至轻度不健康范围内。

这是由于盛行的东南风将苏门答腊的烟雾带到了新加坡。

报告还指出，加里曼丹岛的火灾产生了中等至浓密的烟雾。

“烟雾有可能影响新加坡，”国家环境局补充道。

公众如计划立即参加户外活动，可参考一小时 PM2.5 读数；如计划参加次日活动，可参考 24 小时 PSI 预报。

他们应该注意到，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。