Fig. 1. Administrative divisions of Jining City and lidar distribution

Fig. 2. The structure diagram of aerosol lidar

Fig. 3. Calibration of geometric factors of aerosol lidar with CCD camera (a and b), the signal after cross section uniformity calibration (c), the test signal of atmospheric Rayleigh scattering (d)

Fig. 4. Normalized values of aerosol optical depths measured by lidar and particle (PM_2.5 and PM₁₀) concentrations obtained from state controlling air sampling sites

Fig. 5. Cumulative percentage monthly change of days for each air quality level in Jining

Fig. 6. Normalized values of aerosol optical depth measured by lidar

Fig. 7. Lidar-Based extinction timing maps at each station from May 1 to 8, 2019
(a): Jinma Hotel; (b): Yunhe Building; (c): Rencheng Government; (d): Cisen Pharmaceutical Co., Ltd.

Fig. 8. Observation results of lidar from April 14 to 15, 2018
(a): Extinction timing diagram; (b): Depolarization timing diagram

Fig. 9. Particle concentration from April 14th to 15th, 2018

Fig. 10. Backward trajectory from April 14th to 15th, 2018

Fig. 11. The horizontal scanning result by Lidar at Rencheng government station
(a): May 7, 2018; (b): April 14, 2018