The effect of aerosol temperature and particle concentration upon the intensity of scattered light from an aerosol is investigated. The ratio of the scattered intensity at 30° to the incident intensity is examined by experiment using an incident helium-neon laser beam and mechanically dispersed and electrically neutralized suspensions of aluminum oxide particles in air. The average particle diameter is about 6 μ. The aerosol temperature range is 295°–410°K and the aerosol particle number density range is 140 cm −3 to 515 cm −3 . The predicted linear relationship between the angular scattered intensity ratio and temperature is verified over the temperature range investigated. Also, the intensity ratio at 295°K is shown to vary linearly with the aerosol particle density as expected for single particle scattering.