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A study of the effects of aerosol concentration, aerosol size distribution and relative humidity on the Working Level and the radon daughter concentration was conducted in a 3000 L radon environmental chamber. Typical values of the aerosol concentration varied in the 1 x 10(sup 3) particles cc to 4.5 x 10(sup 5) particles cc range. Various size distributions of aerosols that have mean diffusional aerodynamic diameters of .025 mu m, .045 mu m and .090 mu m were tested. A good correlation was found between the Working Level and the aerosol concentration as well as the relative humidity. Most of the activity seems to be associated with particles of diameter between .05 mu m and .2 mu m. The results presented here are in agreement with work done by other investigators in the health physics field. (Atomindex citation 19:044517)