Abstract: With the rapid development of Hefei's economy and the continuous growth of energy consumption brought about by urbanization and industrialization, the regional composite air pollution dominated by ozone (O3) and fine particulate matter (PM2.5) is becoming increasingly prominent. In order to understand the pollution characteristics and sources of volatile organic compounds (VOCs) in the atmosphere of typical industrial park in Hefei City, China, strengthened monitoring was conducted on the atmospheric quality of a certain industrial park in Hefei City from September to November 2021, and the component characteristics, concentration level, source analysis and reaction activity of VOCs were analyzed. The results show that during the monitoring period, the average value of total volume [φ(VOCs)] was (40.64 ± 8.83) × 10-9, with alkanes and oxygenated volatile organic compounds (OVOCs) accounting for a relatively high proportion of 34.2% and 26.3%, respectively. The total volatile organic compounds (TVOCs) concentration showed a typical dual-peak pattern over time throughout a day, reaching the peak value at 9:00 and 19:00, and the lowest value around 16:00-17:00. This study used PMF model to analyze the sources of VOCs, and the analysis results showed that vehicle emission (25.7%), industrial emission (24.9%), solvents volatilization (19.6%), fuel volatilization (18.6%) and biomass burning emission (11.3%) were the main sources of VOCs during the observation. Ozone generation potential (OFP) of VOCs was 233.05 μg/m3, among which OVOCs contributed the most, accounting for 36.33%.

Key words: Hefei City, volatile organic compounds, pollution characteristics, source analysis, ozone formation potential