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Ambient concentration of ground-level ozone was quantified from 14 petroleum filling stations in Urban and West districts allocated in urban west region Zanzibar between August and November 2019. In situ measurement was conducted for two separate sessions that involved before noon and afternoon in each day in the field using BH-4S Portable multi-gas detector. The analyzed data revealed both temporary and spatial variations of measured parameters. During phase1, the range of ozone was 4.8- 0.6 ppm. During phase2, the range of ozone was 14.2 - 4.5 ppm. The mean values recorded for ozone ranged from 0.6 ppm to 4.8 ppm for phase1, and from 4.5 ppm to 14.2 ppm for phase2. This study revealed that, ground-level ozone is at a point that calls attention tothe environment and health sectors.

Concentrations of Ground-Level Ozone on Petroleum Filling Stations in Urban West Region- Zanzibar