Wintertime meteorological conditions are usually unfavorable for ozone (O3) formation due to weak solar irradiation and low temperature. Here, we observed a prominent wintertime O3pollution event in Shijiazhuang (SJZ) during the Chinese New Year (CNY) in 2021. Meteorological results found that the sudden change in the air pressure field, leading to the wind changing from northwest before CNY to southwest during CNY, promotes the accumulation of air pollutants from southwest neighbor areas of SJZ and greatly inhibits the diffusion and dilution of local pollutants. The photochemical regime of O3formation is limited by volatile organic compounds (VOCs), suggesting that VOCs play an important role in O3formation. With the developed O3formation path tracing (OFPT) approach for O3source apportionment, it has been found that highly reactive species, such as ethene, propene, toluene, and xylene, are key contributors to O3production, resulting in the mean O3production rate (PO3) during CNY being 3.7 times higher than that before and after CNY. Industrial combustion has been identified as the largest source of the PO3(2.6 ± 2.2 ppbv h−1), with the biggest increment (4.8 times) during CNY compared to the periods before and after CNY. Strict control measures in the industry should be implemented for O3pollution control in SJZ. Our results also demonstrate that the OFPT approach, which accounts for the dynamic variations of atmospheric composition and meteorological conditions, is effective for O3source apportionment and can also well capture the O3production capacity of different sources compared with the maximum incremental reactivity (MIR) method.