Fig. 1. Schematic diagram of aerosol lidar construction

Fig. 2. Flow chart of image classification

Fig. 3. Flow chart of image segmentation

Fig. 4. Effect of image segmentation

Fig. 5. Different types of lidar scanning spectra identified by automatic identification technology. (a) Line pollution; (b) point pollution; (c) point pollution + area pollution

Fig. 6. Time series of mass concentrations of PM_2.5, SO₂ and CO from 15:00 local standard time (LST) on December 31, 2022 to 8:00 LST on January 1, 2023

Fig. 7. Lidar horizontal scanning results at 18:00 on December 31, 2022. (a) Extinction coefficient; (b) depolarization ratio

Fig. 8. Lidar horizontal scanning results at 14:00 LST on January 5, 2023. (a) Extinction coefficient; (b) depolarization ratio

Fig. 9. Lidar horizontal scanning results at 14:00 on December 20, 2022. (a) Extinction coefficient; (b) depolarization ratio