The prevalence of allergic rhinitis caused bycotton dust followed job characteristics Jobs Yarn Factory1 Garment ompany2 p1, 2 n% n% Regular exposure to cotton dust3 75 24, 2 66 9, 9 <0, 001 Irregular exposure to cotton dust4 6 10, 3 8 16, 3 0, 361 Total 81 22, 0 74 10, 4 p3, 4 0, 019 0, 157 There was a difference in the prevalence of allergic rhinitis caused by cotton dust in th two groups of direct and indirect workers exposed to dust in 2 factories / companies (p <0.05).