Decreasing trend in SO2 concentrations over Durban: 2004 - 2014

Q3 Environmental Science

Clean Air Journal Pub Date : 2023-12-21 DOI:10.17159/caj/2023/33/2.15451

Barbara Duigan, S. K. Sangeetha, V. Sivakumar

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引用次数: 0

Abstract

The climatology of ambient SO2 air pollution was investigated in Durban, South Africa using data collected by seven air quality monitoring stations (Ferndale, Grosvenor, Jacobs, Wentworth, Settlers School, Southern Works and Prospecton) operated by eThekwini municipality (2004–2014, 2018-2019). These sites constitute a mix of urban and industrial locations. Yearly average trends indicated that no site exceeded the yearly average national guideline (19ppbv) 2004-2014, 2018-2019. Southern Works, Wentworth and Jacobs, recorded highest yearly averages, a consequence of situation within Durban South Industrial Basin (DSIB) while Ferndale recorded lowest yearly averages, a reflection of location in an urban environment. Results of linear fitting to yearly average data (2004-2014) indicated negative trends (all sites). The largest trend was recorded at Jacobs (-0.48ppbv yr-1) and smallest trends observed at Prospecton (-0.12ppbv yr-1), Ferndale (-0.084ppbv yr-1) and Grosvenor (-0.024ppbv yr-1). Using these linear trends, projected SO2 levels were calculated and compared to actual data where it existed (2019 - Wentworth, Settlers, Prospecton), (2018, 2019 Southern Works). Comparison of actual with projected data indicated that except for Prospecton, projected yearly averages are lower than actual yearly averages for these sites. The largest difference between projected and actual data occurred for Southern Works in 2019 (4.10 ppbv). Monthly averages displayed periodic behaviour with maxima recorded in winter and minima in summer. Highest monthly averages were consistently recorded at Wentworth, Jacobs or Southern Works. Maximum monthly average (2004- 2019) was reported at Jacobs, June 2009 (21.71± 2.82ppbv) while minimum monthly average (2004–2019) was reported at Ferndale, December 2012 (0.32±0.04ppbv). Previous Durban SO2 studies are considerably older or of shorter duration than the analysis presented here and are limited as they principally focus on yearly average trends. The determination of SO2 levels over additional averaging periods (monthly average, seasonal variation, seasonal average) coupled with a larger data set and the comparison across sites (industrial vs urban) provides a more detailed exposure profile as experienced by individuals living and working in the eThekwini municipality and thereby expands on previous investigations.

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德班上空二氧化硫浓度的下降趋势：2004 - 2014 年

通过使用由 eThekwini 市政当局运营的七个空气质量监测站（Ferndale、Grosvenor、Jacobs、Wentworth、Settlers School、Southern Works 和 Prospecton）收集的数据（2004-2014 年、2018-2019 年），对南非德班的环境二氧化硫空气污染气候学进行了研究。这些地点包括城市和工业地点。年均趋势表明，2004-2014 年、2018-2019 年没有任何地点超过年均国家指导值（19ppbv）。Southern Works、Wentworth 和 Jacobs 的年均值最高，这是因为它们位于德班南工业盆地 (DSIB) 内，而 Ferndale 的年均值最低，这反映了它们位于城市环境中。对年平均数据（2004-2014 年）进行线性拟合的结果表明（所有地点）均呈负趋势。雅各布斯的趋势最大（-0.48ppbv yr-1），普罗斯佩顿（-0.12ppbv yr-1）、芬代尔（-0.084ppbv yr-1）和格罗夫纳（-0.024ppbv yr-1）的趋势最小。利用这些线性趋势，计算出预测的二氧化硫水平，并与实际数据（2019 年 - Wentworth、Settlers、Prospecton）、（2018 年、2019 年 Southern Works）进行比较。实际数据与预测数据的比较表明，除 Prospecton 外，这些地点的预测年均值均低于实际年均值。预计数据与实际数据的最大差异出现在 2019 年的 Southern Works（4.10 ppbv）。月平均值呈周期性变化，冬季为最大值，夏季为最小值。Wentworth、Jacobs 或 Southern Works 始终录得最高月平均值。据报告，月平均值最大值（2004-2019 年）出现在 Jacobs，2009 年 6 月（21.71± 2.82ppbv），而月平均值最小值（2004-2019 年）出现在 Ferndale，2012 年 12 月（0.32±0.04ppbv）。在更多的平均时段（月平均值、季节变化、季节平均值）确定二氧化硫水平，加上更大的数据集和不同地点（工业与城市）的比较，提供了在特克维尼市生活和工作的个人所经历的更详细的暴露概况，从而扩展了以前的调查。

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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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.