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Estimation of Ozone and Peroxide Levels in the Air of Croatia

Pehnec, Gordana; Klasinc, Leo; Vađić, Vladimira; Šorgo, Glenda (2009) Estimation of Ozone and Peroxide Levels in the Air of Croatia. Croatica Chemica Acta, 82 (2). pp. 543-551. ISSN 0011-1643

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Volume fractions of different atmospheric gas constituents were modelled using Master Mechanism (MM) model developed by S. Madronich (NCAR, Boulder, CO, USA). Ozone (O(3)) and hydrogen peroxide (H(2)O(2)) seasonal variations were estimated at three different locations in Zagreb. Modelled ozone values showed good agreement with measured values at all three sites. The estimation of H(2)O(2) annual variations with the MM model showed typical H(2)O(2) seasonal variation at a remote location and at an urban location not exposed to traffic, with the highest values over the summer months, due to higher solar radiation. The summer/winter differences were more pronounced at the remote location. At the site exposed to traffic, H(2)O(2) volume fractions did not show seasonal variations and H(2)O(2) levels were determined by the levels of nitrogen oxides. The model was also used to estimate oxidant levels during the heat wave in August 2003. It yielded high hydrogen peroxide (2.5 ppb-3.5 ppb) and ozone (> 100 ppb) levels, followed by increased concentrations of OH radicals. The model confirmed that in extreme conditions (high temperature and solar radiation, elevated CO and NO(2) levels) over the summer, the atmospheric oxidizing capacity in Croatia exceedingly rises and may exert harmful effects on the environment.

Item Type: Article
Uncontrolled Keywords: air pollution; Master Mechanism model; oxidants; seasonal variation; hydrogen-peroxide; surface ozone; ambient air; campaign; increase; trends
Subjects: NATURAL SCIENCES > Chemistry
Divisions: Division of Physical Chemistry
Project titleProject leaderProject codeProject type
Karcinogena i potencijalno karcinogena onečišćenja u zraku[51313] Vladimira Vađić022-0222882-2338MZOS
Mjerenje i djelovanje atmosferskih oksidansa[21130] Leo Klasinc098-0982915-2947MZOS
Depositing User: Leo Klasinc
Date Deposited: 18 Oct 2013 12:08

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