Intra-urban variability of PM2.5 in a dense, low-income settlement on the South African Highveld

Abstract

High concentrations of the ambient particulate matter remains a concern on the South African Highveld, particularly in densely populated low-income settlements. These areas have several local emission sources that contribute to poor air quality and are often located close to industrial and other urban areas. The local sources vary in magnitude, space, and time. In South Africa, little has been done to assess the impacts of spatiotemporal variability on the credibility of using isolated ambient observations for regulatory purposes. This study aims to evaluate the intra-urban variability of ambient PM2.5 concentrations in a dense, low-income community. Ambient fine particulate matter (PM2.5) in distinct microenvironments of KwaZamokuhle were simultaneously measured at 4 sites between March and June 2018. These measurements were collected using one permanent ambient monitoring station (AMS) and a temporary network of three E-BAM monitors (Site 2, Site 3, and Site 4). The daily PM2.5 concentrations at AMS, Site 2, Site 3, and Site 4 varied from 10 to 86 µg.m-3, 10 to 103 µg.m-3, 11 to 101 µg.m-3, and 9 to 113 µg.m-3, respectively. Extreme PM2.5 concentrations which exceeded the 24h PM2.5 NAAQS of 40 µg.m-3 were seen during the cold period (May and June); meanwhile, the warm period (March and April) recorded relatively lower PM2.5 episodes across different sections of KwaZamokuhle. During May-June, the highest diurnal concentrations of hourly averaged ambient PM2.5 were recorded at Site 4, in a downward sequence, followed by Site 3, Site 2, and AMS. Furthermore, the results showed that across KwaZamokuhle, Site 4 has the highest proportion of households using solid fuels for domestic purposes (cooking and heating) (55%) and the number of informal dwellings (117 households). Therefore, the study highlights the complexity of quantifying ambient air quality in an area where several local emission sources vary in space and time. Attempts to use monitoring data from a single station to assess ambient air quality, quantify human exposure, or evaluate the potential impacts of mitigation strategies in dense, low-income settlements should be done with care.

Quantification of ambient PM2.5 concentrations adjacent to informal brick kilns in the Vhembe District using low-cost sensors

“…Studies have shown relatively high levels of ambient pollution during winter compared to pollution level in rainy season 75 – 77 . The abrupt increment of wintertime pollution especially PMs concentrations, is primarily ascribed to extensive use of fuel during winter for large-scale heating 31 , 32 , 68 , 78 , 79 . Previous findings by Aniyikaiye et al 51 (2021a) in the study area also indicated highest levels of the brickmaking industrial operations during winter.…”

State of ambient air quality in a low-income urban settlement of South Africa

“…The observed substantial PM 10 during the winter period can be attributed to two factors. Firstly, given that at this time of the year ambient temperatures sharply drop, this results in an increment in the domestic burning of solid fuels as residents resort to such energy sources as are cheap and easily available within these communities [ 26 , 27 ]. An increment in residential consumption of solid fuel, especially during winter thus makes this season to be characterized by substantially high PM 10 pollution.…”

South Africa’s electricity disaster is an air quality disaster, too

“…wood, coal, paraffin) to meet some of their energy needs, now become even more reliant on these. The use of these fuels greatly contributes to poor ambient and indoor air quality (e.g., Pauw et al, 2022;Walton et al, 2021;Wernecke et al, 2021;Wernecke et al, 2015, Hersey et al, 2015, Naidoo et al, 2014Moletsane et al, 2021). These generator and residential burning emissions are of course released in very close proximity to people, have a high inhalation intake fraction and represent an increased health risk to humans and the environment.…”