also interesting to note that the high VOC concentrations on the mornings of these two days were dominated by xylenes. The source of these xylenes is discussed in Section 4.8.2.
Figure 4.2. Diurnal variation of O3 observed at Tai O during episode days.
4.2.1. Summary: The diurnal variation of O3 at TO was similar for all ozone episode days, although the magnitude of the peak concentration did vary. The peak on the most severe episode, 203 ppbv on November 7, was the highest on record in the Hong Kong area. In general, O3 concentrations on the episode days were observed to begin their rise relatively late in the morning and peak relatively early in the afternoon (i.e., ~ 1600 hours).
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