Numbers of real-time data (E-BAM) of PM_2.5 were collected in the period from Jan 8^th 2012 to Jan 1^st 2013 at the laboratory of Tropical Ocean University (Sanya, China). The average mass concentration was 19.7 μg/m³. The highest 40.5 μg/m³ in October compared to the lowest 14.1 μg/m³ in July. From a seasonal perspective, the average PM_2.5 mass concentration in fall and winter are relatively higher than that in both spring and summer. On the basis of satellite map of fire points and backward trajectories of the air masses, we primarily deduced that the PM_2.5 in Sanya may be caused by the biomass burning and industrial pollutants from the area of Pearl River Delta of China and the Indo-China peninsula (e.g. Vietnam, Laos).

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 1) the daily variation characteristics of ozone pollution in Sanya City conform to the typical characteristics of ozone photochemical pollution events and 2) 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. 3) The O₃ emission reduction plan is to reduce the ozone concentration from 180 µg·m^− 3 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.