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Clark, Lara P. ; Sreekanth, V. ; Bekbulat, Bujin ; Baum, Michael ; Yang, Songlin ; Baylon, Pao ; Gould, Timothy R. ; Larson, Timothy V. ; Seto, Edmund Y. ; Space, Chris D. ; et al ( , Sensors)We propose a low-cost passive method for monitoring long-term average levels of light-absorbing carbon air pollution in polluted indoor environments. Building on prior work, the method here estimates the change in reflectance of a passively exposed surface through analysis of digital images. To determine reproducibility and limits of detection, we tested low-cost passive samplers with exposure to kerosene smoke in the laboratory and to environmental pollution in 20 indoor locations. Preliminary results suggest robust reproducibility (r = 0.99) and limits of detection appropriate for longer-term (~1–3 months) monitoring in households that use solid fuels. The results here suggest high precision; further testing involving “gold standard” measurements is needed to investigate accuracy.more » « less