Quantifying personal exposure to traffic and household air pollution: a pilot study among street traders in Lagos, Nigeria

Background: Ambient and household air pollution (HAP) exposure is associated with adverse health outcomes. Heavy traffic congestion, street trading, and the use of biomass fuels are common in Lagos, Nigeria. We designed this study to evaluate the feasibility of measuring prolonged personal exposure to air pollution among street traders. We aimed to quantify average 24-hour exposure to air pollution and evaluate how proximity to major highways influences these levels. Methods: ) using a bespoke monitoring unit held in a backpack. We also measured blood pressure (BP) and performed spirometry. Results: for both groups with diurnal peaks. Spirometry parameters and BP were similar between the two groups. Conclusions: Device acceptability and measurement site selection are pivotal in participant recruitment. Successful gender-inclusive recruitment necessitates appropriate monitoring equipment and measurement at sites convenient for participants. All street traders experienced consistently high air pollution levels throughout the day, regardless of proximity to the highway. These findings provide valuable insights to guide future large-scale research.