Change Characteristics and Source Apportionment of Ozone Pollution in Sanya City in 2019

Sanya has geographical and climatic characteristics such as low latitude, high temperature, high salt, high humidity, and strong solar radiation all year round, which is conducive to the occurrence of photochemical reactions; therefore, the problem of ozone photochemical pollution in Sanya needs to be solved urgently. This article is based on the hourly data of O₃ and NO₂ in Sanya City in 2019, various collected meteorological data, and online monitoring of VOC_S major species data to analyze the characteristics of ozone pollution changes and source apportionment in Sanya City. The results indicate that the daily variation characteristics of ozone pollution in Sanya City conform to the typical characteristics of ozone photochemical pollution events, and the EKMA curve indicates that Sanya City as a whole belongs to a NO_X-sensitive area. The OH consumption rate (L^OH) and ozone generation potential (OFP) indicate that the key active components of VOC_S are mainly isoprene, ethylene, n-butane, propane, etc. The corresponding main potential sources of emissions include combustion emissions, solvent volatilization, and automotive exhaust emissions. The O₃ emission reduction plan is to reduce the ozone concentration from 180 to 158 µg·m⁻³, corresponding to a 25 and 20% reduction in the concentrations of the two main precursors, NO_X and VOC_S, respectively. This article provides scientific support for the problem of ozone photochemical pollution in Sanya City.