Assessment of Respiratory Health Impacts of PM_2.5 by AirQ+ Software in a Sub-Saharan African Urban Setting

Background: Ambient air pollution remains a major risk factor for population health worldwide. The impact of PM_2.5 air pollution is underestimated in sub-Saharan Africa due to a lack of epidemiological studies. AirQ+ is proposed to reduce these inequalities in research. The aim of this study is to assess, by AirQ+, the impact of prolonged exposure to PM_2.5 on respiratory health in Kinshasa in 2019, and to estimate the health benefits of reducing this air pollution. Methods: Population and mortality data were obtained from the Institut National de la Statistique and the Institut de Métrologie et d’Évaluation en santé, respectively. PM_2.5 concentrations were measured using PurpleAir PA-II-SD sensors, and average annual concentration was 43.5 µg/m³ in 2019. AirQ+ was used to estimate the health effect attributable to PM_2.5 in adults aged over 25 in Kinshasa. Results: In 2019, the proportion of deaths attributable to PM_2.5 air pollution was 30.72% for ALRI, 26.55% for COPD and 24.32% for lung cancers. Each 10% reduction in current PM_2.5 levels would prevent 1093 deaths (from all causes) per year in Kinshasa. Life expectancy would increase by 4.7 years (CI 3.5–5.3) if the WHO threshold of 5 mg/m³ were respected. Conclusions: The results of this study highlight the major respiratory public health problem associated with air pollution by fine particles in Kinshasa. AirQ+ was used to assess the impact of prolonged exposure to PM_2.5 and respiratory deaths among adults in Kinshasa and revealed that this number of deaths could be avoided by improving air quality.