AN ANALYSIS OF PM2.5 USING THE DIRECTED ACYCLIC GRAPH: A CASE STUDY OF SOUTHEAST ASIA

Q4 Environmental Science

Pollution Research Pub Date : 2022-09-30 DOI:10.53550/pr.2022.v41i03.037

Busarakam Pratansup, Pannapa Changpetch

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Abstract

In this study, we used the directed acyclic graph (DAG) to analyze a dataset of PM2.5 concentrationlevels in 11 cities in Southeastern Asian countries for the period of March 18 to April 11, 2021. Thisis the period that PM2.5 posted a major problem for several cities in Southeast Asia. We analyzedthe data to determine the effect of the PM2.5 concentration in each city on that of each of the othercities. The results show that the PM2.5 concentration in Yangon, Myanmar, had a direct effect onthe PM2.5 concentration in Chiang Mai, Thailand, and that the PM2.5 concentration in KualaLumpur, Malaysia, had a direct effect on the PM2.5 concentration in Singapore, Republic ofSingapore. Where one country has a direct effect on another, a reduction or increase of PM2.5 in theformer will reduce or increase, respectively, the PM2.5 concentration in those on which it has aneffect. Given this relationship, if the concentration of PM2.5 is to be reduced either overall or in anyspecific country is to be reduced, international cooperation will be essential. Our application ofDAG to this environmental issue exemplifies the viability of this technique for exploring andindicating solutions for real-world problems more generally.

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用有向无环图分析pm2.5:以东南亚为例

在这项研究中，我们使用有向无环图（DAG）分析了2021年3月18日至4月11日期间东南亚国家11个城市PM2.5浓度水平的数据集。这是PM2.5成为东南亚几个城市主要问题的时期。我们分析了数据，以确定每个城市的PM2.5浓度对其他城市的影响。结果表明，缅甸仰光PM2.5浓度对泰国清迈PM2.5浓度有直接影响，马来西亚吉隆坡PM2.5浓度直接影响新加坡共和国PM2.5浓度。在一个国家对另一个国家有直接影响的情况下，前者PM2.5的减少或增加将分别减少或增加其影响国家的PM2.5浓度。鉴于这种关系，如果要全面降低PM2.5的浓度，或者要降低任何特定国家的PM2.5浓度，国际合作将至关重要。我们将DAG应用于这一环境问题，证明了这一技术在更广泛地探索和指示现实世界问题的解决方案方面的可行性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Pollution Research Environmental Science-Water Science and Technology

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期刊介绍： POLLUTION RESEARCH is one of the leading enviromental journals in world and is widely subscribed in India and abroad by Institutions and Individuals in Industry, Research and Govt. Departments.