Harness low-cost sensors for the targeted assessment of policy

In this Perspective, we present the case for low-cost sensors (LCS) to be taken up in a new and specific application: the targeted assessment of individual policies. We present examples in which LCS have been used to this end, discuss their strengths and weaknesses, and provide a rubric for conducting such targeted policy assessments. We encourage the strategic deployment of LCS for the measurement of air quality in this context.