engleski

Comparison of Active and Passive Mesurement of Ozone in Zagreb Air

There are several methods to measure ozone concentrations in ambient air, including automatic devices, classical passive and active methods and bioindicators. Automatic devices are based on UV absorption and are used often because they are accurate and precise. They enable continuous monitoring and can provide averages of ozone concentrations on hourly basis. However, classical active and passive methods of sampling and analysis are often used instead (NIOSH 1977 ; Monn and Hangartner 1990 ; UNEP/WHO 1994, Koutrakis et al. 1993, Hangartner et al. 1996 ; Zhou and Smith 1997).Those methods are usually simple and less expensive. In ambient air measurements passive sampling methods based on free diffusion or permeation through a membrane can provide weekly or monthly averages only, whereas air protection laws and guidelines are usually expressed in daily and hourly averages.

ambient air pollution; UV absorption

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