University of Tehran Journal of Environmental Studies 1025-8620 33 41 2007 05 22 - - 18355 FA Journal Article Use of passive samplers has major advantages with respect to weight, cost and maintenance. In order to measure ambient concentration of nitrogen dioxide, a diffusion type passive sampler was made and then investigated. The manufactured samplers were exposed to ambient air in parallel with continuous chemiluminescence analyzer during weekly to four-week periods. The results show good repeatability as well as good agreement between passive and instrumental methods. Optimum time of exposure was found to be one week. Use of passive samplers has major advantages with respect to weight, cost and maintenance. In order to measure ambient concentration of nitrogen dioxide, a diffusion type passive sampler was made and then investigated. The manufactured samplers were exposed to ambient air in parallel with continuous chemiluminescence analyzer during weekly to four-week periods. The results show good repeatability as well as good agreement between passive and instrumental methods. Optimum time of exposure was found to be one week. https://jes.ut.ac.ir/article_18355_943c84b16aaafd25f1c0d243cdd357d6.pdf