Fig. 1. Ultraviolet laser backscattering model for detecting haze

Fig. 2. Ultraviolet laser scattering probability distribution

Fig. 3. UV laser backscattering impulse response

Fig. 4. PM2.5 concentration 100 µg/m³

Fig. 5. PM2.5 concentration 300 µg/m³

Fig. 6. PM2.5 concentration 500 µg/m³

Fig. 7. Backscattering echo peak power of laser pulses with different widths

Fig. 8. Backscattering echo half-height full width of laser pulses with different widths

Fig. 9. Backscattering echo peak delay of laser pulses with different widths