Academic Journal
Dramatic improvement of aerosol pollution status over the East Asian ocean: from the establishment of Japanese environmental quality standard for PM2.5 in 2009 to its achievement in 2021
| العنوان: | Dramatic improvement of aerosol pollution status over the East Asian ocean: from the establishment of Japanese environmental quality standard for PM2.5 in 2009 to its achievement in 2021 |
|---|---|
| المؤلفون: | Syuichi Itahashi, Itsushi Uno |
| المصدر: | Environmental Research Letters, Vol 19, Iss 4, p 044065 (2024) |
| بيانات النشر: | IOP Publishing |
| سنة النشر: | 2024 |
| المجموعة: | Directory of Open Access Journals: DOAJ Articles |
| مصطلحات موضوعية: | East Asia, environmental quality standard (EQS), aerosol optical depth, MODIS, Environmental technology. Sanitary engineering, TD1-1066, Environmental sciences, GE1-350, Science, Physics, QC1-999 |
| الوصف: | The severe aerosol pollution in East Asia has been a focus of much research. In Japan, the environmental quality standard (EQS) for PM _2.5 was established in 2009 (daily average, 35 μ g m ^−3 ; annual average, 15 μ g m ^−3 ), and its achievement rate was below 50% during the early 2010s. Then, the PM _2.5 concentration gradually decreased, the achievement rate improved, and the EQS for PM _2.5 was finally achieved (100%) in fiscal year (FY) 2021. Because transboundary aerosol pollution is an important factor in Japanese air quality, here we analysed the long-term dataset of the satellite-measured fine-mode aerosol optical depth (AOD _f ) over the East Asian ocean to reveal the changes in the transboundary aerosol over East Asia. Overall, a decrease in AOD _f was seen over the entire East Asian ocean during the period analysed. A gradual declining trend in AOD _f was measured (−4% to −5%/year over the adjacent ocean around Japan) and corresponded well to the trend in PM _2.5 concentration observed in Japan (−5.3%/year) during FY2010–FY2021. Due to the domestic contribution in Japan, the negative trend was slightly greater for Japanese PM _2.5 concentration than for AOD _f over the adjacent ocean around Japan, and we concluded that the main reason for the dramatic air quality improvement in PM _2.5 in Japan was driven by the improvement of transboundary aerosol pollution over East Asia. In addition, the 12 year analysis period (FY2010 to FY2021) was divided into three parts: stagnation (FY2010 to FY2014), in which PM _2.5 and AOD _f remained the same as they were in FY2010; improvement (FY2015 to FY2018), in which PM _2.5 and AOD _f declined dramatically; and achievement (FY2019 to FY2021), in which PM _2.5 and AOD _f declined further. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 1748-9326 |
| Relation: | https://doi.org/10.1088/1748-9326/ad37ce; https://doaj.org/toc/1748-9326; https://doaj.org/article/80424249c85a4869a6d7de0f10c88d95 |
| DOI: | 10.1088/1748-9326/ad37ce |
| الاتاحة: | https://doi.org/10.1088/1748-9326/ad37ce https://doaj.org/article/80424249c85a4869a6d7de0f10c88d95 |
| رقم الانضمام: | edsbas.811852E1 |
| قاعدة البيانات: | BASE |
Full Text Finder | تدمد: | 17489326 |
|---|---|
| DOI: | 10.1088/1748-9326/ad37ce |