Standard ozone monltorlng technlques utlllze large, heavy, and expenslve Instruments that are not easlly adapted for personal or mlcroenvlronmental monltorlng. For largescale monltorlng projects, where spatlal varlatlons of a pollutant and human exposure assessments are of Interest, passlve sampllng devlces can provide the methodology to meet monltorlng and statlstlcal goals. Recently we developed a coated fllter for ozone collectlon that we used In a commerclally available passive sampllng devlce. Results from the ozone sampler valldatlon tests are presented. The paoslve ozone sampler used In fleld and laboratory experlments consists of a badge clip supportlng a barrel-shaped body whlch contalns two coated glass flber fllters. The principal component of the coatlng is nltrlte Ion, which In the presenceof ozone Is oxldlzed to nltrate Ion on the fllter medlum, N01-+ 0 3 -NOS-+ 0 2 .After sample collectlon, the filters are extracted wlth ultrapure water and analyzed for nltrate Ion by Ion chromatography. The results from laboratory and fleld valldatlon tests lndlcate excellent agreement between the paslve method and standard ozone monltorlng technlques. We have determined that relative humldlty (ranglng from 10 to 80%) and temperature (ranglng from 0 to 40 "C) at typlcal amblent ozone levels (40-100 ppb) do not Influence sampler performance. Face veloclty and sampler orlentation with respect to wlnd dlrectlon affected the sampler's collectlon rate of ozone. By using a protectlve cup which acts as both a wlnd screen and a raln cover, we were able to obtain a constant collectlon rate over a wlde range of wlnd speeds.