Fig. 2: Daily variation of PM2.5, meteorological parameters, and wind patterns over Delhi. | npj Clean Air

Fig. 2: Daily variation of PM2.5, meteorological parameters, and wind patterns over Delhi.

From: The role of atmospheric feedback and groundwater conservation policies in degrading air quality in Delhi

Fig. 2

a 5year daily mean variation of PM2.5 (μg/m3) averaged over Delhi for comparison to in situ measurement and Prepon scenario. b Daily mean variation of wind speed (m/s) and surface temperature (K). c Daily mean variation of ventilation index (m2/s) and PBLH (m). d Frequency of occurrence of wind direction for each station of Delhi, each the coloured line denotes N (0–45), NE (46–90), E(91–135), SE(136–180), S(181–225), SW (226–270), W(271–315) and NW(316–360) directions of wind. The concentric circles denote the magnitude of the occurrence.

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