The size and scattering coefficient of urban aerosol particles at Washington, DC as a function of relative humidity.

Abstract

The relative humidity dependence of the size and scattering coefficient of atmospheric aerosol particles was measured at Washington, DC during the period 26-31 July 1979. Particle growth curves were calculated using measured values of the particle composition parameter. The light-scattering coefficient as a function of (decreasing) relative humidity was measured directly by controlling the relative humidity of the air flowing to an integrating nephelometer. A smooth variation of scattering coefficient with humidity was observed. -from Authors