{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,19]],"date-time":"2026-04-19T19:25:03Z","timestamp":1776626703139,"version":"3.51.2"},"reference-count":62,"publisher":"MDPI AG","issue":"20","license":[{"start":{"date-parts":[[2023,10,16]],"date-time":"2023-10-16T00:00:00Z","timestamp":1697414400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Fine particulate matter (PM2.5) is associated with adverse impacts on ambient air quality and human mortality; the situation is especially dire in developing countries experiencing rapid industrialization and urban development. This study assessed the spatio-temporal variations of PM2.5 and its health impacts in the South Asian region. Both satellite and station-based data were used to monitor the variations in PM2.5 over time. Additionally, mortality data associated with ambient particulate matter were used to depict the overall impacts of air pollution in this region. We applied the Mann\u2013Kendall and Sen\u2019s slope trend analysis tool to investigate the trend of PM2.5. At the same time, clustering of backward trajectories was used for identifying the long-range air mass transport. The results revealed that the mean annual PM2.5 mass concentration was the highest (46.72 \u00b5g\/m3) in Bangladesh among the South Asian countries during 1998\u20132019, exceeding the national ambient air quality standards of Bangladesh (i.e., 15 \u00b5g\/m3) and WHO (10 \u00b5g\/m3), while lower PM2.5 was observed in the Maldives and Sri Lanka (5.35 \u00b5g\/m3 and 8.69 \u00b5g\/m3, respectively) compared with the WHO standard. The trend analysis during 1998\u20132019 suggested that all South Asian countries except the Maldives experienced an increasing trend (p &lt; 0.05) of PM2.5. The study showed that among the major cities, the mean annual PM2.5 value was the highest in New Delhi (110 \u00b5g\/m3), followed by Dhaka (85 \u00b5g\/m3). Regarding seasonal variation, the highest PM2.5 was found during the pre-monsoon season in all cities. The findings of this research would help the concerned governments of South Asian countries to take steps toward improving air quality through policy interventions or reforms. Moreover, the results would provide future research directions for studying the trend and transport of atmospheric PM2.5 in other regions.<\/jats:p>","DOI":"10.3390\/rs15204975","type":"journal-article","created":{"date-parts":[[2023,10,16]],"date-time":"2023-10-16T01:31:22Z","timestamp":1697419882000},"page":"4975","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Assessment of Spatio-Temporal Variations in PM2.5 and Associated Long-Range Air Mass Transport and Mortality in South Asia"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5220-5970","authenticated-orcid":false,"given":"Md Sariful","family":"Islam","sequence":"first","affiliation":[{"name":"Media Lab, Massachusetts Institute of Technology, Cambridge, MA 02139, USA"}]},{"given":"Shimul","family":"Roy","sequence":"additional","affiliation":[{"name":"Department of Environmental Science and Resource Management, Mawlana Bhashani Science and Technology University, Tangail 1902, Bangladesh"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2088-9180","authenticated-orcid":false,"given":"Tanmoy Roy","family":"Tusher","sequence":"additional","affiliation":[{"name":"Department of Environmental Science and Resource Management, Mawlana Bhashani Science and Technology University, Tangail 1902, Bangladesh"}]},{"given":"Mizanur","family":"Rahman","sequence":"additional","affiliation":[{"name":"Department of Geosciences, Florida Atlantic University, Boca Raton, FL 33431, USA"}]},{"given":"Ryley C.","family":"Harris","sequence":"additional","affiliation":[{"name":"Department of Political Science and Geography, Old Dominion University, Norfolk, VA 23529, USA"}]}],"member":"1968","published-online":{"date-parts":[[2023,10,16]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"462","DOI":"10.1016\/S0140-6736(17)32345-0","article-title":"The Lancet Commission on Pollution and Health","volume":"391","author":"Landrigan","year":"2018","journal-title":"Lancet"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"257","DOI":"10.1126\/science.1247348","article-title":"Particulate Matter Matters","volume":"344","author":"Dominici","year":"2014","journal-title":"Science"},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Han, F., Lu, X., Xiao, C., Chang, M., and Huang, K. 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