Fig. 3: Key meteorological factors influencing spring MDA8 O3 for each site, 2013–2022.
From: Rapid increase in spring ozone in the Pearl River Delta, China during 2013-2022
a The 1st most important meteorological variable. Circles and squares represent meteorological variables positively and negatively impacting ozone growth. b Same with (a) the 2nd most important meteorological variable. c Same with (a) the 3rd most important meteorological variable.
