Extended Data Table 3.

Global mean surface mixing ratio and tropospheric burden of inorganic halogens

^$Total inorganic halogen abundance X_y (with X = Cl, Br, I) is defined in the footnote of Extended Data Table 2.

^&Tropospheric burden (Tropo) has been computed considering the chemical tropopause (e.g O₃ < 150 ppbv).

^£Note that the NoSLH scheme does not include iodine chemistry but considers long-lived chlorine and bromine.