Figure 2-1, which is a schematic of the photochemical smog mechanism. Ozone production occurs as a result of a series of reactions initiated by the oxidation of VOCs or CO by the hydroxyl radical (OH). For example,

where RH represents a generic hydrocarbon (or VOC), R is a hydrocarbon

Figure 2-1

Schematic of the photochemical pathways leading to the production of ozone and the termination steps that dominate under NOx-limited and VOC-limited regimes.

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