Fig. 3: Scatterplots between drone-based PM2.5 measurements and stationary sensor-measured PM2.5 values, color coded by RH.
From: Drone measurements reveal high near-surface urban haze
Intercomparison experiments conducted prior to the measurement campaign for minimizing the impacts of humidity on PM-LCS performance on 16 March (a) Drone setup without dehumidifier (b) drone setup with dehumidifier, and, for minimizing the impacts of the rotor downwash on the PM2.5 mass concentration values on 16 March, morning time (c) without sampling inlet (d) with a sampling inlet. The intercomparison experiment was carried out with the drone hovering with the payload for 16 minutes (16 data points with a 1-minute average of PM2.5 data).
