Fig. 3: Map of the percentage increase in ozone concentration when uptake of HO2 is switched off for 1750, 1970 and 2014.
From: Suppression of surface ozone by an aerosol-inhibited photochemical ozone regime

Percentage increase in monthly mean solar 15:00 lt O3 concentration for July when heterogeneous uptake of HO2 on aerosols is switched off for 1750, 1970 and 2014.