新冠肺炎封锁期间Sasol Secunda监测站报告的环境空气质量数据——南非普马兰加

Q3 Environmental Science

Clean Air Journal Pub Date : 2021-03-23 DOI:10.17159/CAJ/2021/31/1.8954

A. Venter, S. D. Vos

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引用次数: 2

摘要

关于新冠肺炎封锁对环境空气质量的影响，国内外发表了多项研究。在大多数情况下，随着环境二氧化硫水平的不同变化，已观察到环境氮氧化物和PM浓度的减少。Secunda位于南非普马兰加省的高原区，以其以煤为主要原料的大型工业设施而闻名。塞孔达镇和恩巴伦勒镇为沙索尔提供了大部分劳动力，因此是本研究的重点。由于封锁期间人类行为的变化、对沙索尔设施的熟悉以及环境空气质量监测站的战略位置，对塞孔达地区的环境空气质量进行了评估。结果显示，环境CO、NO2和PM浓度明显下降，尤其是在封城的前两周。环境监测站的环境H2S和SO2污染物浓度变化不大。在封城结束和封城结束后，所有环境物种的温度都呈上升趋势，而随着冬季的到来，环境温度则呈下降趋势。这也与在封锁(阶段性停工)后一个月进行年度维护的工厂的排放量减少背道而驰。本文的结论是，人类行为对CO、NO2和PM污染物种类有重大的局部环境影响，而H2S浓度曲线与工业园区的活动水平更直接相关。环境SO2趋势与设施活动(如H2S)没有类似的相关性，但与Secunda和eMbalenhle附近的各种本地和区域来源有更强的相关性。更有效的发射高度所带来的更好的色散特别是在局部尺度上的影响被认为是物质的。此外，关于当地空气质量的气象因素已被证明是研究领域观测到的环境空气质量水平的一个重要因素

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Ambient air quality data reported at Sasol Secunda monitoring stations during COVID-19 lockdown – Mpumalanga, South Africa

Various local and international research has been published on the effects of COVID-19 lockdown on ambient air quality. In most cases, a reduction in ambient NOx and PM concentrations have been observed with varying changes in ambient SO2 levels. Secunda, located in the Highveld Priority Area in Mpumalanga, South Africa is known for its large industrial facilities utilising coal as primary feedstock. The towns of Secunda and eMbalenhle provide the majority of the workforce to Sasol and has therefore been the focus of this study. The ambient air quality in the Secunda region was assessed due to the changes in human behaviour during lockdown, familiarity with the Sasol facility and the strategic locations of ambient air quality stations.Results show a clear decrease in ambient CO, NO2 and PM concentrations, especially during the first two weeks of lockdown. Only subtle changes were observed for ambient H2S and SO2 pollutant concentrations at the ambient monitoring stations. An increasing trend in all ambient species was observed towards the end and post lockdown, in contrast to declining ambient temperatures with the onset of winter. This is also contrary to the reduction in emissions from the factory that conducted annual maintenance in the month following lockdown (phase shutdown). This article concludes that human behaviour has a material local ambient impact on CO, NO2 and PM pollutant species, while H2S concentration profiles are more directly related to the industrial complex’s levels of activity. Ambient SO2 trends did not show a similar correlation with the facility’s activities (as H2S), but a stronger correlation was observed with the diverse local and regional sources in close proximity to Secunda and eMbalenhle. The influence of better dispersion especially on a local scale, brought about by more effective emission heights, is considered material. Moreover, meteorological factors, on local air quality, has been shown to be a material contributor to observed ambient air quality levels in the study domain

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来源期刊

Clean Air Journal Environmental Science-Management, Monitoring, Policy and Law

CiteScore

1.80

自引率

0.00%

发文量

审稿时长

8 weeks

期刊介绍： Clean Air Journal is the official publication of the National Association for Clean Air, a not-for-profit organisation. Clean Air Journal is a peer-reviewed journal for those interested in air quality, air quality management, and the impacts of air pollution relevant to Africa. The focus of the journal includes, but is not limited to: Impacts of human activities and natural processes on ambient air quality Air quality and climate change linkages Air pollution mitigation technologies and applications Matters of public policy regarding air quality management Measurement and analysis of ambient and indoor air pollution Atmospheric modelling application and development Atmospheric emissions Other topics on atmospheric physics or chemistry with particular relevance to Africa The scope of the journal is broad, but the core theme of the journal is air quality in Africa.