[Ozone Pollution Control Strategies Based on VOCs Source Apportionment].

The frequent O3 pollution in China occurs mainly in volatile organic compounds （VOCs） control areas. However， a simulation focusing on the influence of reduction from different VOCs sources is lacking. Thereby， we conducted online observations of 116 types of VOCs and HCHO based on liquid phase chemistry in the summer of 2024 in Nanjing. A positive matrix factorization （PMF） model was further combined with observational-based model （OBM） to explore O3 control policies for emission reduction from different pollution sources. As a result， the maximum 8h moving average of O3[ρ（MDA8-O3）] in Nanjing exceeded the national standard （222 μg·m-3）， and the average volume mixing ratio of total VOCs （including HCHO） was 30.2×10-9， dominated by oxygenated VOCs and alkanes. Acetaldehyde， formaldehyde， and isoprene as the top three species contributed 51.8% of the total ozone formation potential （151 μg·m-3）. Motor vehicle sources （33.9%） and industrial sources （26.4%） were the main sources of TVOCs. OBM simulation captured the measured O3 （R=0.86） well， and the O3 pollution in Nanjing was found to be in the VOCs control areas by the EKMA curve. The O3 could reach the standard through a moderate reduction of VOCs （40%） or substantial reduction of NOx （70%）. The scenario based on the observations and PMF resolved spectrum showed that O3 pollution was more sensitive to motor vehicle sources and industrial sources， wherein reducing 90% of either source， respectively， could significantly reduce O3 and reach the standard. This study on a basis of the measured pollutants could simulate the photochemical process in the real atmosphere to provide a theoretical suggestion for O3 pollution control.