Effectiveness of functional symptoms in the study group Objects Symptoms Group drug Communication group Effectiveness of intervention (%) Before intervention (n=54) After intervention (n=54) Before intervention (n=53) After Intervention (n=53) n% n% n% n% No symptoms of itching 12 22, 2 36 66, 7 13 24, 5 23 43, 4 123, 3 No symptoms of sneezing 3 5, 6 25 46, 3 2 3, 8 14 26, 4 132, 0 No symptoms of runny nose 9 16, 7 35 64, 8 11 20, 8 21 39, 6 197, 6 No symptoms of stuffy nose 21 38, 9 45 83, 3 24 45, 3 33 62, 3 76, 6 After intervention, the prevalence of asymptomatic nasal irritation increased from 22.2% to 66.7% in the Montelukast workers group; No symptons of sneezing increased from 5.6% to 46.3%; No symptoms of runny nose increased from 16.7% to 64.8% and no signs of stuffy nose increased from 38.9% to 83.3%.