Characterization and Source Identification of Volatile Organic Compounds (VOCs) Pollution in an Industrial Park in Lianyungang City

Industrial emissions significantly contribute to atmospheric volatile organic compounds (VOCs), but the contribution varies with different regional industrial structures, transportation, and meteorological conditions, necessitating region-specific studies. Based on online monitoring data form May 2023 to April 2024, this study explores the temporal variation characteristics and source apportionment of VOCs in an industrial park in Lianyungang City. The results show that the average concentration of 57 kinds of VOCs during observation was (20.3±15.5)×10–9 (in volume fractions), with alkanes (70.4%) being an important component of VOCs; the average volume fraction of ozone formation potential (OFP) was 44.4×10–9, with olefines (45.7%) contributing the most to ozone production; The monthly average volume fraction of VOCs showed winter-high and summer-low trend, with the highest in December and the lowest in August; the diurnal variation exhibited a bimodal pattern, with high values mainly appearing from 6 to 9 a.m. and 6 to 7 p.m.; The PMF source apportionment results indicated that the sources of VOCs in the observation area were motor vehicle emission sources (31.3%), solvent use sources (30.7%), petrochemical sources (15.3%), industrial combustion sources (12.9%) and oil and gas volatile sources (9.8%); The potential source contribution function model (PSCF) results showed that potential source area of VOCs were mainly concentrated in western and north of Shandong Province. The final analysis of high-concentration VOCs pollution events clarifies the importance of regional management.