Fig. 1. Sampling points during the observation period

Fig. 2. The proportion of TVOCs components in Hefei industrial park from September to November, 2021

Fig. 3. Top 10 species by VOCs concentration (IQR: Interquartile range)

Fig. 4. The proportion and concentration of VOCs components in Hefei industrial park from September to November 2021

Fig. 5. Diurnal variation characteristics of atmospheric VOCs in Hefei industrial park. (a) TVOCs; (b) VOCs in each component

Fig. 6. Time series of VOCs and meteorological parameters during observation in 2021. (a) Volume fraction; (b) temperature; (c) humidity; (d) wind speed

Fig. 7. The proportion of each VOCs component

Fig. 8. Diurnal variation characteristics of O₃ and VOCs OFP during observation. (a) TVOCs and O₃; (b) VOCs in each component

Fig. 9. [in Chinese]

Fig. 10. Contribution of major VOCs emission sources in Hefei industrial park

Fig. 11. Correlation of characteristic species. (a) Benzene and toluene; (b) isopentane and n-pentane; (c) xylene and ethylbenzene