新加坡煙霾緩和 五區PSI全部回落中等水平Singapore haze eases, PSI in all five regions falls back to moderate levels
新加坡《海峽時報》報道，9月30日晚11時，全國五個區的24小時空氣汙染指數全部回落至中等水平，中部為99，其餘各區介乎81至99。之前一日形勢嚴峻，9月29日上午中部一度升至164，創今個煙霾季節新高，五區首次同時進入不健康水平。環境局預料10月1日有雨，但風向仍為東南或南風，煙霾風險未完全解除。According to Singapore's The Straits Times, at 11 PM on September 30, the 24-hour air pollution index in all five regions of the country fell back to moderate levels, with the central region at 99 and the other regions ranging from 81 to 99. The situation was severe the previous day; on the morning of September 29, the central region once rose to 164, setting a new high for this haze season, with all five regions entering the unhealthy level simultaneously for the first time. The Environment Agency expects rain on October 1, but the wind will still be from the southeast or south, so the haze risk has not been completely eliminated.
Haze in S’pore: Air quality returns to moderate levels in all regions
- The 24-hour Pollutant Standards Index (PSI) in Singapore returned to moderate levels across all regions by 11pm on Sept 30, after reaching unhealthy peaks earlier in the haze season.
- The highest PSI recorded was 164 on Sept 29 in the central region, surpassing previous highs and causing air quality to enter the unhealthy range across all five regions.
- NEA forecasts moderate to low unhealthy haze levels continuing due to dry conditions in nearby areas, with showers expected but smoke haze risk remains due to prevailing south-east or south winds.
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SINGAPORE – The 24-hour Pollutant Standards Index (PSI) readings across all regions returned to moderate levels as at 11pm on Sept 30.
This comes after the central region reached a new peak this haze season early on Sept 29, when air quality across Singapore breached the unhealthy band for the first time in two weeks.
As at 11pm on Sept 30, the PSI reading for the central region was 99, while the values for the other regions ranged from 81 to 99. This is down from a peak of 134 in the central and western regions earlier in the day at 1am.
The PSI reading is a 24-hour rolling average of six key air pollutants and is used in planning for outdoor activities the next day.
Air quality is considered unhealthy when the 24-hour PSI is in the range of 101 to 200, during which the National Environment Agency (NEA) advises the public to at least reduce outdoor activities. PSI readings of 51 to 100 are considered moderate, while values of zero to 50 are in the “good” range.
Early on Sept 29, the PSI value in the central region reached a new peak this haze season, standing at 164 at 10am, surpassing the previous high of 154 on Sept 15.
Also on Sept 29, the readings in all five regions here surpassed the 101 threshold into the unhealthy range. The last time that happened was also Sept 15.
The hourly PM2.5 readings for all regions are all in the normal band as of 11pm on Sept 30, with the values ranging between 18 and 37.
PM2.5 readings, which indicate the current concentrations of fine particulate matter, are considered elevated if they fall between 56 and 150, and high if they are between 151 and 250.
NEA has advised the public to refer to the hourly PM2.5 reading if they are considering immediate activities and the 24-hour PSI readings to plan for the day ahead.
In its daily haze advisory on Sept 30, NEA said the 24-hour PSI is forecast to be in the “moderate to low unhealthy” range, following an improvement in the haze situation with showers over Singapore and the surrounding region.
Dry conditions are forecast to continue over parts of southern Sumatra and south-western Kalimantan. While showers are expected over Singapore and the surrounding region again on Oct 1, the risk of smoke haze affecting the Republic remains as the prevailing winds are expected to blow from the south-east or south.
The PSI crossed into the unhealthy range around four weeks ago, hitting 101 in central Singapore on the morning of Sept 4. In the days that followed, readings in the central, eastern and western parts of the island occasionally crossed into the unhealthy range.
The developments in September mark the first time since October 2023 that the PSI in Singapore hit unhealthy levels because of haze, with the authorities earlier warning of the risk of haze between June and October as a result of warmer and drier conditions brought on by both El Nino and the Indian Ocean Dipole.
Haze in Singapore: Air quality returns to moderate levels in all regions
- By 11 p.m. on September 30, the 24-hour Pollutant Standards Index (PSI) in Singapore had returned to moderate levels across all regions, after earlier reaching unhealthy peaks during the haze season.
- The highest PSI recorded was 164 on September 29 in the central region, exceeding previous highs and causing air quality to reach the unhealthy range in all five regions.
- The NEA forecasts that moderate to low unhealthy haze levels will continue due to dry conditions in nearby areas. Although showers are expected, the risk of smoke haze remains due to prevailing southeast or south winds.
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SINGAPORE – The 24-hour Pollutant Standards Index (PSI) readings across all regions returned to moderate levels as of 11pm on September 30.
This comes after the central region reached a new peak this haze season early on September 29, when air quality across Singapore exceeded the unhealthy level for the first time in two weeks.
截至9月30日晚上11点，中央地区的PSI读数为99，而其他地区的数值在81到99之间。这比当天凌晨1点中央和西部地区的高峰134有所下降。
The PSI reading is a 24-hour rolling average of six key air pollutants and is used in planning for outdoor activities the next day.
当24小时的PSI值在101到200之间时，空气质量被认为是不健康的，此时国家环境局（NEA）建议公众至少减少户外活动。PSI读数在51到100之间被认为是中等，而零到50的值属于“良好”范围。
Early on September 29, the PSI value in the central region reached a new peak for this haze season, standing at 164 at 10 a.m., surpassing the previous high of 154 on September 15.
Also on Sept 29, the readings in all five regions here exceeded the threshold of 101, entering the unhealthy range. The last time this happened was also on Sept 15.
截至9月30日晚上11点，各地区的每小时PM2.5读数均在正常范围内，数值介于18到37之间。
PM2.5 readings, which indicate the current concentrations of fine particulate matter, are considered elevated if they are between 56 and 150, and high if they are between 151 and 250.
NEA has advised the public to refer to the hourly PM2.5 readings if they are considering immediate activities and the 24-hour PSI readings to plan for the day ahead.
In its daily haze advisory on September 30, NEA said the 24-hour PSI is expected to be in the 'moderate to low unhealthy' range, following an improvement in the haze situation with showers over Singapore and the surrounding region.
Dry conditions are forecast to continue over parts of southern Sumatra and southwestern Kalimantan. While showers are expected over Singapore and the surrounding region again on October 1, the risk of haze affecting the Republic remains, as the prevailing winds are expected to blow from the southeast or south.
The PSI crossed into the unhealthy range around four weeks ago, reaching 101 in central Singapore on the morning of September 4. In the following days, the readings in the central, eastern, and western parts of the island occasionally entered the unhealthy range.
The developments in September mark the first time since October 2023 that the PSI in Singapore reached unhealthy levels due to haze, with authorities previously warning of the risk of haze between June and October as a result of warmer and drier conditions caused by both El Niño and the Indian Ocean Dipole.
原文出處：Source: The Straits Times（新加坡 ↗