Results-3-5% of all operatives had byssinosis, 55 (5.3%) chronic bronchitis, 36 (3.5%) work related persistent cough, 55 (5.3%) non-byssinotic work related chest tightness, and 56 (5.3%) work related wheeze. A total of 212 static work area dust samples (range 0-04-3-23 mg/M3n) and 213 personal breathing zone samples (range 0-14-24*95 mglm3) were collected. Percentage of predicted FEV, was