Fig. 1. Flowchart for BB0819 spores preparation process

Fig. 2. SEM images and morphology model of freeze-dried and hot-air dried BB0819 spores (actual morphology of BB0819 spores is outlined by the dashed line box, and the simulated morphology model is drawn inside the solid line box). (a) Freeze-dried BB0819 spores; (b) hot-air dried BB0819 spores

Fig. 3. Bioaerosol extinction performance testing system. (a) Schematic of bioaerosol extinction performance testing system; (b) aerosol chamber

Fig. 4. Results of FT-IR spectral peaks identification and 2DCOS. (a) FT-IR spectral peaks identification; (b) results of 2DCOS

Fig. 5. Absorbance fitting results of main components and protein secondary structure. (a) Absorbance of main components; (b) absorbance of protein secondary structure

Fig. 6. Fitting results of protein secondary structure in various wavebands for two spores. (a) Freeze dried BB0819 spores; (b) hot-air dried BB0819 spores

Fig. 7. Results of CRI and simulation results of DDA method and Monte Carlo algorithm. (a) Real part of CRI; (b) imaginary part of CRI; (c) extinction cross section; (d) absorption cross section; (e) scattering cross section; (f) transmittance

Fig. 8. Test results of transmittance in the aerosol chamber. (a) MIR band; (b) FIR band

Fig. 9. Comparison between simulated data and experimental results