Fig. 8: Co-location of 50 sensors over a 2 week period, taking 60 s averages over the whole period, performed in Lisbon, Portugal.
From: Detecting urban PM2.5 hotspots with mobile sensing and Gaussian process regression
Left: Differences of all 50 sensors from the mean over time. Right: Histogram of the mean of all 50 sensors 60 s PM2.5 averages.
