Fig. 3: Positive or negative (P/N) effects of individual drivers on O3 formation as estimated by RF-PDP and effects as estimated by LIME.

a and b Show P effects of isoprene and T. c and d Show N effects of NOx and RH. e Shows effects of drivers as estimated by LIME when O3 concentration closed to the M8A9. When O3 pollution is severe, temperature and important active VOCs have a significant positive impact on O3 generation, while RH and NOx have an obvious negative impact.