Thermal Drift in Low-Cost PM2.5 Sensors: A Two-Year Field Study in Dhaka
Abstract
Low-cost optical particulate sensors are increasingly deployed in dense urban networks, but their calibration is typically validated over weeks rather than years. We report drift characteristics for 38 co-located sensors over 24 months, and show that a single temperature-compensation term fitted in the first month loses validity after roughly 300 days.
Keywords:
air qualitysensor calibrationPM2.5urban monitoringdrift
References
- Zheng, T., et al. (2018). Field evaluation of low-cost particulate matter sensors. Atmos. Meas. Tech.
- Jayaratne, R., et al. (2018). The influence of humidity on the performance of low-cost air particle mass sensors.