| Autor: |
Howlett-Downing, Chantelle, Boman, Johan, Molnár, Peter, Shirinde, Joyce, Wichmann, Janine |
| Předmět: |
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| Zdroj: |
Environmental Forensics; Oct2024, Vol. 25 Issue 5, p442-456, 15p |
| Abstrakt: |
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] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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