Assessing Fine Particulate Matter (PM(2.5)) Pedestrian Exposure in Urban Environments: Low-Cost Sensor Deployment and Preliminary Findings in Puebla’s Historic Center

Abstract

In urban areas, people are systematically exposed to fine particulate matter (PM(2.5)) while commuting or engaging in public activities. Therefore, it is crucial to use devices for measuring PM(2.5). Low-cost sensors (LCS) are an emerging technology with the potential to enable accurate measurements at a fraction of the cost and on a mobile platform. This study provides insights into the construction, programming, and calibration of LCS-equipped devices, along with the initial findings from pedestrian measurements on streets and avenues in the historic center of Puebla. The results show that, in addition to vehicle emissions, the resuspension of particulate matter by automobiles at pedestrian crossings is an essential factor for PM2.5 exposure among individuals who halt at traffic lights. PM(2.5) levels in several areas of Puebla City’s historic center exceed permitted levels, underscoring the importance of this research for public health.