Fig. 1. Multi-platform multi-dimensional monitoring system of atmospheric environment and its functions

Fig. 2. Effect of air pollution control on characteristic emission factors and climate change (climatic effects of VOCs and BC are not fully determined)^[12]

Fig. 3. Spectrogram of optical monitoring of atmospheric trace components

Fig. 4. Vertical distributions of NO₂ monitored by MAX-DOAS. (a) NO₂ vertical distribution under stable weather; (b) NO₂ vertical distribution during transport progress

Fig. 5. Space-time distributions of aerosol and O₃ monitored by lidar. (a) Vertical profiles of aerosol and O₃ under different transport heights^[21]; (b) space-time distributions of O₃ during transport progress; (c) regional reconstruction of PM_2.5 vertical distribution

Fig. 6. Surface greenhouse gases monitored by Fourier transform infrared spectrometer in Hefei

Fig. 7. CO₂ results observed by FTIR in TCCON Hefei station. (a) Total column concentration of CO₂ from 2015 to 2020; (b) comparison of CO₂ column concentration observed by FTIR with GOSAT satellite data

Fig. 8. Retrieved column abundances of four gases on October 1, 2019 and October 3, 2019^[55]. (a)--(d) Column abundances of CO₂, O₂, CH₄, and H₂O on October 1, 2019; (e)--(h) column abundances of CO₂, O₂, CH₄, and H₂O on October 3, 2019

Fig. 9. Comparison of column concentrations of CO₂, CH₄, and H₂O obtained by high resolution laser heterodyne solar radiation spectral detection system and GOSAT^[55]

Fig. 10. Monitoring results of vehicle platform. (a) NO₂ monitored by DOAS; (b) aerosol extinction coefficient monitored by lidar^[57]; (c) column concentration of CO₂ monitored by FTIR

Fig. 11. Timeline of development progress of remote sensing satellite for pollution and greenhouse gas monitoring

Fig. 12. Horizontal and vertical distributions of air pollutants and greenhouse gases. (a)(b) TROPOMI NO₂ horizontal distributions; (c) TROPOMI O₃ vertical distribution; (d) TROPOMI CO horizontal distribution (pentagram represents factory outlet location)^[83]; (e) OCO-2 CO₂ horizontal distribution

Fig. 13. Space-air-ground integrated atmospheric optical stereoscopic monitoring network in Jing-Jin-Ji region