engleski

Ozone levels in the Rijeka Bay area, Northern Adriatic, Croatia, 1999-2007

The first evaluation of ozone concentration at four selected sampling sites is given: urban site 1, resort site 2, industrial (‘fence line’) site 3 and suburban site 4. The lowest ozone level was found at site 1, while the highest was obtained at the suburban site 4, as expected. All sites exhibit decline in ozone concentrations, the most pronounced at suburban site 4, while the concentration is almost constant at resort site 2. The concentration roses for site 3 and 4 agree with the prevailing wind directions, pointing to the coastal line, where the major pollution sources are detected. In spite of the dominant wind direction from the N–NW sector, the dominant sector in concentration rose is SW at site 1, while there is no distinct direction in the concentration rose at resort site 2. Due to different meteorological conditions, the AOT40 values differ considerably, e.g. several thousands in 2007 or up to 45 000 μg m−3 h in 2005.

air pollution; ozone; trends; concentration roses; AOT40

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