Modeling ozone formation from alkene reactions using the Carbon Bond chemical mechanism

► The CB05 chemical mechanism is used widely in photochemical air quality models. ► New reactions are developed to explicitly model propene and isobutene within CB05. ► Modeling shows that explicit propene and isobutene reactions change oxidant predictions. ► Using the new explicit reactions is recommended in circumstances where propene and isobutene dominate oxidant production.