Abstract
The new bag-type passive samplers were developed for ambient air ozone. The diffusive passive samplers consist of a polypropylene round box of the size 30 mm × 12 mm with an open cap, Teflon filters or stainless steel meshes as wild shield, and a collecting cellulose filter impregnated with NaNO 2. The calibration of the new passive samplers was conducted by using the automatic analyzer. The new passive samplers were exposed to a roadside air in HoChiMinh City simultaneously with Ogawa passive samplers and the automatic analyzer. Both the new and the Ogawa passive samplers showed good agreement with the automatic analyzers. The new passive samplers were deployed to monitor ambient air ozone at 15 sites in HoChiMinh City. The observed monthly average ozone concentration was 11 μg/m 3.
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