Roostaei Vahid, Gharibzadeh Farzaneh, Shamsipour Mansour, Faridi Sasan, Hassanvand Mohammad Sadegh
Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
Department of Research Methodology and Data Analysis, Institute for Environmental Research (IER), Tehran University of Medical Sciences, Tehran, Iran.
Heliyon. 2024 Oct 24;10(21):e39726. doi: 10.1016/j.heliyon.2024.e39726. eCollection 2024 Nov 15.
Numerous investigations have explored variations in vertical air pollutant concentrations, yielding diverse findings. So, we have conducted this systematic review to gain a more comprehensive understanding of the vertical distribution of air pollutant concentrations (PM, PM, NO, and NO) and the influencing factors.
Relevant studies were identified by searching the three central electronic databases, PubMed, Web of Science, and Scopus, from the beginning of 2000 to the end of 2023. This study included original articles published in English that examine the pollutant concentration variations below 500 m.
Of 3614 articles, 57 studies met our criteria. Our findings showed a decline in PM and NO concentrations as altitude increased, while NO concentrations exhibited an increase. Conversely, no statistically significant relationship was identified between altitude and PM concentrations. The regression analysis yielded coefficients for the relationship between concentration and altitude (0-500 m) as follows: PM (-0.11), PM/PM (0.0008), NO (-0.11), and NO (0.13). Conducting additional research on this topic and investigating the impact of meteorological parameters on pollutant concentrations at different altitudes enhances our understanding of the vertical distribution of pollutant concentrations.
众多研究探讨了垂直方向上空气污染物浓度的变化，结果各异。因此，我们进行了这项系统综述，以更全面地了解空气污染物浓度（PM、PM、NO和NO）的垂直分布及影响因素。
通过检索三个主要电子数据库，即PubMed、Web of Science和Scopus，确定2000年初至2023年底的相关研究。本研究纳入了以英文发表的、研究500米以下污染物浓度变化的原创文章。
在3614篇文章中，57项研究符合我们的标准。我们的研究结果表明，随着海拔升高，PM和NO浓度下降，而NO浓度则上升。相反，海拔与PM浓度之间未发现统计学上的显著关系。浓度与海拔（0 - 500米）之间关系的回归分析得出的系数如下：PM（-0.11）、PM/PM（0.0008）、NO（-0.11）和NO（0.13）。对该主题进行更多研究并调查气象参数对不同海拔高度污染物浓度的影响，可增进我们对污染物浓度垂直分布的理解。
