Gin mote, linter, and soft cotton mill waste samples were collected from five cotton garnetting and two cotton waste recycling facilities and examined for their leaflike trash content. Foreign particles were removed from 50 to 100 gram samples. Nonfibrous particles greater than 50 microns in diameter were removed manually, and each nonfibrous fragment was sorted as leaflike trash, seed trash, bark strands, grass strands, exocarp and mesocarp, endocarp, petiole and wood material, or other material. Leaflike trash was sifted through a screen and fragments of 500 to 999 microns were used in friability tests. Fifteen milligram lots of leaflike trash were milled and sifted to determine the resistance to pulverization. The amount of leaflike trash depended upon the raw material being used, and leaflike trash from soft cotton mill wastes and gin motes was less easily pulverized than material from raw cotton. The author suggests that the incidence of byssinosis among garnetting and waste recycling workers is low, despite reportedly high concentrations of dust because garnetting raw materials contain smaller amounts of leaflike trash than those contained in raw cotton, they have greater resistance to pulverization, and their fiber matrix is more entangled, thus more likely to retain particulate. Other factors, such as space volume and air flow in the processing area, energy imparted to botanical trash by processing machinery, hooding of machinery, and amount of material being processed, also are likely to affect the concentrations of cotton dust in the workplace atmosphere.