The prevalence of allergic rhinitis caused by cotton dust followed seniority Seniority Yarn Factory1 Garment Company2 Total p1, 2 n% n% n% <10 years 41 25, 2 33 8, 7 74 13, 6 <0, 001 10 - ≤ 20 18 25, 4 30 11, 4 48 14, 3 0, 003 >20 years 22 16, 4 11 15, 7 33 16, 2 0, 897 Total 81 22, 0 74 10, 4 155 14, 3 p 0, 147 0, 166 0, 675 The prevalence of allergic rhinitis caused by cotton dust among workers did not different according to seniority in the yarn factory and garment company (p> 0.05).