Abstract
This study investigates the exposure of construction workers to particulate matter during typical on-site activities, a key occupational health concern. Field measurements were conducted at construction sites in Norway and Spain using a wearable monitoring system integrated into a backpack, consisting of an Alphasense OPC-R2 sensor, Raspberry Pi, and power bank. Workers carried the device during their workday and recorded their activities. The study also compared measurements from low-cost sensors, a stationary lab-grade monitor, and personal sampling of respirable dust. Results showed significant variability between different measurement methods, highlighting the need for careful calibration to ensure data reliability. Discrepancies between sensors and reference instruments underline the importance of validated measurement approaches. The findings emphasize the need for continuous and accurate monitoring of dust exposure, particularly during high- risk construction activities, to improve occupational health and safety standards in environments affected by airborne particulates.