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Quantifying the impact of COVID-19 restrictions on air pollution in Ahvaz: a comparative dual-approach assessment of observed against baseline and forecasted criteria air pollutants

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Abstract

In response to the COVID-19 pandemic, the Iranian government swiftly implemented immediate and decisive measures to control the spread of the infection. This study aims to demonstrate the impact of restriction measure on air pollution, also to highlight the potential variability in results that can arias from different methodological approach. A comprehensive dual-approach assessment was conducted to evaluate the effect of the lockdown measures on criteria air pollutants. Firstly, a traditional approach compared air quality during the pandemic period with baseline conditions from 2013 to 2019. Secondly, observed air pollution values during different periods with varying restrictions in 2020 were compared with expected values. This comprehensive analysis allows for a robust comparison and quantification of the impact of different lockdown measures in Ahvaz. The study revealed significant changes in air pollutant concentrations in Ahvaz during 2020, with variations observed across different pollutants. Notable reductions were observed in O3 levels, particularly in November (-54.44% compared to the baseline) and December (-63.58% compared to expected values). Decreases in CO levels were observed in multiple months, while substantial reductions in PM10 and PM2.5 were observed during various periods. Inconsistencies in the magnitudes and directions of changes were found when comparing baseline and forecasted values. The overall stringency index showed an inverse association with changes in O3, NO2, and CO, with international travel controls and restrictions on internal movement having significant impacts. This study provides valuable insights into the impact of COVID-19 lockdown measures on air pollution in Ahvaz, Iran, using a comprehensive dual-approach assessment. The findings highlight the effectiveness of these measures in reducing specific criteria air pollutants and emphasize the importance of implementing appropriate strategies for air quality management during similar public health emergencies.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author upon reasonable request.

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Acknowledgements

The study was approved by Ahvaz Jundishapur University of Medical Sciences. Air pollutants and meteorological data were provided by the Khuzestan Environmental Department, (Ahvaz Office)

Funding

The study is supported by a grant from Student Research Committee, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.

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Authors and Affiliations

Authors

Contributions

Neda Kaydi.: Writing—Original Draft and Project administration Morteza Abdullatif Khafaie: Conceptualization, Methodology, Writing—Review & Editing and Funding acquisition Neemat Jaafarzadeh: Conceptualization, Methodology, and Supervision, Elham Maraghi: Data Curation and Formal analysis, Bamshad Shenavar.: Resources and Visualization, Zeinab Bahrami.: Writing—Review & Editing, Alireza Azarian.: Resources, Soghra Rostami.: Resources, interpretation of data. Mehdi Mojadam.: Resources, Validation, Faezeh Jahedi.: Resources, interpretation of data. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Neemat Jaafarzadeh or Morteza Abdullatif Khafaie.

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The study received ethical approval from Ahvaz Jundishapur University of Medical Sciences (IR.AJUMS.REC.1402.328).

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Kaydi, N., Maraghi, E., Bahrami, Z. et al. Quantifying the impact of COVID-19 restrictions on air pollution in Ahvaz: a comparative dual-approach assessment of observed against baseline and forecasted criteria air pollutants. Environ Monit Assess 196, 1079 (2024). https://doi.org/10.1007/s10661-024-13231-8

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