Fig. 1. Transit trajectories of CALIPSO satellite. (a) Clean day; (b) haze; (c) cloudy day

Fig. 2. Variations of PM₁₀ and PM_2.5 mass concentrations. (a) Clean day; (b) haze; (c) cloudy day

Fig. 3. Backscatter coefficient profiles of aerosol. (a) Clean day; (b) haze; (c) cloudy day

Fig. 4. Mean 532-nm extinction coefficient profiles for two lidar inversions. (a) Clean day; (b) haze; (c) cloudy day

Fig. 5. Mean 532-nm depolarization ratio profiles. (a) Clean day; (b) haze; (c) cloudy day

Fig. 6. Mean color ratio profiles. (a) Clean day; (b) haze; (c) cloudy day

Fig. 7. Depolarization-ratio frequency distributions of aerosol at different altitudes. (a) Clean day; (b) haze; (c) cloudy day

Fig. 8. Color-ratio frequency distributions of aerosol at different attitudes. (a) Clean day; (b) haze; (c) cloudy day

Fig. 9. Aerosol type classification. (a) Clean day; (b) haze; (c) cloudy day

Fig. 10. HYSPLIT back trajectories in 48 h. (a) Clean day; (b) haze; (c) cloudy day