Abstract Optical remote sensing of PM2. 5 concentration complements ground-based in situ sampler observations and depends on aerosol extinction-to-mass conversion and meteorological factors. Based on Mie scattering theory. we derived a non-linear analytical expression among the PM2. https://www.lightemupsequences.com/best-flash-PrimaDonna-Deauville-Rio-Brief-Paradise-Green-great-choice/