INOE's Sun Sky Lunar multiband photometer is recognized as the worldwide reference for aerosol observing networks. Numerous applications take advantage of the aerosol charateristics and atmospheric optical properties provided by this photometer: Climate and climate change studies; Air quality monitoring and forecast; Near real time detection of volcanic ash plumes;SDS (Sand Dust Storm) monitoring and forecast; Calibration of satellite borne instruments; Validation of satellite aerosol products; Calibration of Ocean Color satellite borne instruments.