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Spatial distribution of O3 formation regime and HO2/OH ratio at 7 sites on (a) 15, (b) 16, (c) 17, (d) 18 and (e) 19 September. Bars in red, green and blue represent NOx-limited, transitional, and VOC-limited regime, respectively, based on the HO2/OH ranges listed in Table 1. Numbers above the bars are the corresponding HO2/OH ratios. Points in red, green and blue represent NOx-limited, transitional, and VOC-limited regime identified by sensitivity analysis, respectively.
