Analysis of Ozone pollution characteristics and collaborative control measures in a district of Chongqing

Abstract

As the largest economic center city in Southwest China and the upper reaches of the Yangtze River, Chongqing Municipality's air quality situation was crucial to the improvement of national air quality. The main conclusions of this study, based on measurements and data analysis of meteorological conditions, nitrogen oxides, air temperature, radiation intensity, relative humidity, and volatile organic compounds (VOCs) in specific areas of the Nan'an District were as follows:The most favorable conditions for generating ozone were temperature between 30 and 40 °C, humidity between 25 %–60 %, high radiation intensity, and high concentration of nitrogen dioxide; Ozone-generating VOC species include aromatic hydrocarbons, halogenated hydrocarbons, alkanes, olefins, organic sulfur, oxygenated and nitrogenous hydrocarbons, while this study quantified the contribution of each VOCs species to ozone generation, with aromatic hydrocarbons contributing the most, followed by olefins, clarifying the key precursors for regional ozone control; inter-regional cooperation should be strengthened, and the policy of prevention and control of air pollution should be actively carried out, and the neighboring districts and counties should strengthen their communication, prevention, control and synergistic coordination in the management of ozone pollution.