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The impact of the COVID-19 lockdown on global air quality: A review

机译：COVID-19锁定在全球空气的影响质量:一个回顾

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摘要

Abstract The coronavirus disease 2019 (COVID-19) was declared a pandemic by the World Health Organization (WHO) on March 11, 2020. As a preventive measure, the majority of countries adopted partial or complete lockdown to fight the novel coronavirus. The lockdown was considered the most effective tool to break the spread of the coronavirus infection worldwide. Although lockdown damaged national economies, it has given a new dimension and opportunity to reduce environmental contamination, especially air pollution. In this study, we reviewed, analyzed and discussed the available recent literature and highlighted the impact of lockdown on the level of prominent air pollutants and consequent effects on air quality. The levels of air contaminants like nitrogen dioxide (NO2), sulphur dioxide (SO2), carbon monoxide (CO), and particulate matter (PM) decreased globally compared to levels in the past few decades. In many megacities of the world, the concentration of PM and NO2 declined by?>?60% during the lockdown period. The air quality index (AQI) also improved substantially throughout the world during the lockdown. Overall, the air quality of many urban areas improved slightly to significantly during the lockdown period. It has been observed that COVID-19 transmission and mortality rate also decreased in correlation to reduced pollution level in many cities.
机译：摘要冠状病毒疾病2019 (COVID-19)被宣布大流行世界卫生吗组织(WHO)在2020年3月11日。预防措施,绝大多数的国家采用部分或完全锁定对抗新型冠状病毒打破传播的最有效的工具冠状病毒感染。锁定国家经济受损,它给了一个新维度和机会减少环境污染,尤其是空气污染。并讨论了最近文献和可用的突出显示锁定水平的影响著名的空气污染物和结果对空气质量的影响。污染物,如二氧化氮(NO2)、硫二氧化碳(二氧化硫),一氧化碳(CO),可吸入颗粒物(PM)在全球范围内减少而在过去几十年的水平。世界上许多大城市,浓度点和NO2下降了> ?锁定时间。全世界大大改善在封锁。许多城市略有改善明显在封锁期间。COVID-19传播和被观察到死亡率也下降相关在许多城市减少污染程度。

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