TY - JOUR AU - Moletsane, Simon D. AU - Lindeque, Farina AU - Language, Brigitte AU - Ncobile C.Nkosi, AU - Adesina, Joseph A. AU - Burger, Roelof P. AU - Mkhatshwa, Gabi AU - Piketh, Stuart J. PY - 2021/04/29 Y2 - 2024/03/29 TI - Intra-urban variability of PM2.5 in a dense, low-income settlement on the South African Highveld JF - Clean Air Journal JA - Clean Air J. VL - 31 IS - 1 SE - Research Article DO - 10.17159/caj/2021/31/1.9413 UR - https://cleanairjournal.org.za/article/view/9413 SP - AB - <p><span style="font-weight: 400;">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 PM</span><span style="font-weight: 400;">2.5 </span><span style="font-weight: 400;">concentrations in a dense, low-income community. Ambient fine particulate matter (PM</span><span style="font-weight: 400;">2.5</span><span style="font-weight: 400;">) 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 PM</span><span style="font-weight: 400;">2.5</span><span style="font-weight: 400;"> concentrations at AMS, Site 2, Site 3, and Site 4 varied from 10 to 86 µg.m</span><span style="font-weight: 400;">-3</span><span style="font-weight: 400;">, 10 to 103 µg.m</span><span style="font-weight: 400;">-3</span><span style="font-weight: 400;">, 11 to 101 µg.m</span><span style="font-weight: 400;">-3</span><span style="font-weight: 400;">, and 9 to 113 µg.m</span><span style="font-weight: 400;">-3</span><span style="font-weight: 400;">, respectively. Extreme PM</span><span style="font-weight: 400;">2.5 </span><span style="font-weight: 400;">concentrations which exceeded the 24h PM</span><span style="font-weight: 400;">2.5 </span><span style="font-weight: 400;">NAAQS of 40 µg.m</span><span style="font-weight: 400;">-3</span><span style="font-weight: 400;"> were seen during the cold period (May and June); meanwhile, the warm period (March and April) recorded relatively lower PM</span><span style="font-weight: 400;">2.5 </span><span style="font-weight: 400;">episodes across different sections of KwaZamokuhle. During May-June, the highest diurnal concentrations of hourly averaged ambient PM</span><span style="font-weight: 400;">2.5 </span><span style="font-weight: 400;">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.</span></p> ER -