Figure 2.

Fractional pathway of HA reactivity via Maillard reactions estimated in global aerosol as a function of pH, based on extrapolation of bulk aqueous rate constants to aqueous aerosol where [AS] = 0.081 M (black), amino acid concentration = 0.068 M (red), primary amine concentration = 0.0034 M (blue), and total Maillard reaction fraction (green dashed line). Reaction of HA with OH radicals in the aqueous phase (with [^•OH] = 1 × 10^–13 M)³³ makes up almost all of the remainder of aerosol-phase reactivity.