Fig. 2: Diurnal variations of aerosol composition, trace gases, and meteorological parameters.
From: Drone measurements reveal high near-surface urban haze
a Average diurnal variation of the bulk aerosol chemical composition mass fraction (organics, inorganics and equivalent black carbon, eBC). The solid white line with circle markers shows the variation of the mean chloride mass concentration. Chloride peaks were identified throughout the campaign during the late night and early morning periods. b Average diel variation of NOx (solid brown line), NO2 (solid light green line), SO2 (solid red line) and PM2.5 (solid blue line) observed at ground level. The shaded regions show the standard deviations for each species measured. Most of the measured parameters show the trends where peaks were observed during the morning and late night. c Average diel variation of O3 (solid dark yellow line), CO (solid grey line), and eBC (solid black line) mass concentrations. d Average diel cycle of the ALWC (dashed black line), together with RH (in red dots) and temperature (color coded). The ALWC trend shows higher values during the early morning, similar to the chloride mass concentration profile.
