Figure 8.

Carbon oxidation state plot of CHO compounds in smog-chamber experiments (a), aqueous-phase experiments (b), and CHNO compounds in smog-chamber experiments (c). Smog-chamber experiments were from the photooxidation of methacrolein in the presence of NO_x, and aqueous-phase experiments were from the photooxidation of methacrolein in NO_x-free conditions. The gray area indicates the part of the plot showing data more affected by uncertainty in formula assignments, where a unique formula assignment with a resolving power of 100 000 is not possible.