CURRENT STATUS OF NEAR-SURFACE OZONE POLLUTION RESEARCH IN CHINA
Keywords:
Ozone pollution, Research review, PM2.5 synergistic control, VOCs, NOx, Control sensitivity, Regional transportAbstract
In recent years, with the effective control of fine particulate matter (PM2.5) pollution in China, the problem of near-surface ozone (O3) pollution has become increasingly prominent, becoming one of the important factors restricting the continuous improvement and attainment of ambient air quality standards. This article systematically reviews the latest progress in research on near-surface ozone pollution in China. Studies show that since the 13th Five-Year Plan, the overall O3 concentration in China has shown a trend of first rising and then plateauing, exhibiting significant regional differences and seasonal high incidence in key urban clusters such as the Beijing-Tianjin-Hebei region and the Yangtze River Delta. In terms of formation mechanism, the nonlinear relationship between ozone formation and its precursors, nitrogen oxides (NOx) and volatile organic compounds (VOCs), has always been the core of research: most urban central areas are in VOCs control zones, while regional background areas and some suburban areas are mostly NOx control zones or transition zones, and their control sensitivity dynamically evolves with the progress of pollution reduction . Meteorological conditions, especially extreme high temperatures and strong solar radiation, have a significant promoting effect on ozone formation and accumulation, and the "heat wave-ozone" compound pollution is gradually becoming a new prominent problem. In terms of prevention and control strategies, the synergistic control of ozone and PM2.5 has risen to an important strategic direction. It is urgent to implement differentiated NOx and VOCs emission reduction measures based on precise sensitivity analysis, and to strengthen regional joint prevention and control mechanisms. Future research should focus on the synergistic governance of compound pollution, refined source spectrum analysis and efficient control of VOCs, the microscopic processes of ozone formation, and the systematic upgrading of forecasting and early warning technologies.References
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