fatemeh khodarahmi1 1 dept. of environmental health engineering, school of public health, ilam university of medical sciences, ilam, iran. zahra soleimani2 2 dept. of environmental health engineering, school of public health and paramedical, semnan university of medical sciences, semnan, iran. samira yousefzadeh2 nadali alavi3 3 department of environmental health engineering, school of public health, ahvaz jundishapur university of medical sciences, ahvaz, iran ali akbar babaei3 mohammad javad mohammadi3