[Ozone Pollution Characteristics and Formation Mechanism in a Typical Tropical Seaside City].

To investigate the pollution characteristics and formation mechanism of ambient air ozone(O) in a typical tropical seaside city, we conducted an observational experiment on O and its precursors at an urban site in Haikou, Hainan Province, from June to October 2019. The O pollution characteristics were analyzed comprehensively; the O-NO-VOCs sensitivities and key precursors were determined, and the control strategies for O pollution were carried out. The results were as follows:1 O pollution in Haikou mainly occurred in September and October, with daily maximum 8-h O concentrations in the range of 39-190 μg·m, and the daily variation in O was unimodal, peaking at approximately 14:00.