1. Source Apportionment of PM2.5 and PM2.5-Bound Trace Elements in Pretoria, South Africa.
- Author
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Howlett-Downing, Chantelle, Boman, Johan, Molnár, Peter, Shirinde, Joyce, and Wichmann, Janine
- Subjects
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AIR quality management , *BIOMASS burning , *AIR pollutants , *PARTICULATE matter , *TRACE elements - Abstract
Outdoor PM2.5 samples were collected for 34 months in Pretoria, South Africa from 18 April 2017 to 28 February 2020. The average total PM2.5 concentration was 23.2 ± 17.3 µg.m3 (0.69–139 µg.m−3), with the highest mean recorded during winter and the lowest during summer (p < 0.05). The sources were determined by means of cross referencing the US EPA PMF 5.0 program and the NOAA HYsplit model. The sources of the total PM2.5 were mining (33%), resuspended dust (24%), industry (15%), general exhaust (12%), vehicular emissions (12%) and biomass burning (4%). Sources of air pollutants are both ubiquitous and seasonal. Highlights: In central Pretoria, the largest contributing sources of PM2.5 are resuspended dust matrix and mining from surrounding areas; A winter analysis was run where As, Se and Pb was included in the dataset, confirming biomass burning sources which were typically higher during the winter season; and Air quality management policies should address both ubiquitous and seasonal sources. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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