iForest - Biogeosciences and Forestry


Ambient ozone phytotoxic potential over the Czech forests as assessed by AOT40

I Hunová   , M Schreiberová

iForest - Biogeosciences and Forestry, Volume 5, Issue 3, Pages 153-162 (2012)
doi: https://doi.org/10.3832/ifor0617-005
Published: Jun 25, 2012 - Copyright © 2012 SISEF

Research Articles

Ambient ozone (O3) represents one of the most prominent air pollution problems in Europe. We present an analysis on O3 with respect to its phytotoxic potential over Czech forests between 1994 and 2008. The phytotoxic potential is estimated based on the exposure index AOT40 for forests calculated from real-time monitoring data at 24 rural sites. Our results indicate high phytotoxic potential for most of the Czech Republic (CR) with considerable inter-annual and spatial variability. The highest AOT40 values were 38-39 ppm·h. The critical level for forest protection (5 ppm·h) was usually exceeded early in the growing season, generally in May. In years with meteorological conditions conducive to ozone formation, the critical level was exceeded by 5-7 folds as compared to years with non-conducive conditions; nevertheless, all sites consistently exceeded the critical level since 1994. In the extremely hot and dry year 2003, the critical level for forests was exceeded over 31 % of the Czech forested area. More research is needed to translate these exceedances into forest injury in the CR.


Ozone, AOT40, Time trends, Spatial patterns

Authors’ address

I Hunová
M Schreiberová
Czech Hydrometeorological Institute, Na Šabatce 17, 143 06 Prague 4 - Komorany (Czech Republic)

Corresponding author

I Hunová


Hunová I, Schreiberová M (2012). Ambient ozone phytotoxic potential over the Czech forests as assessed by AOT40. iForest 5: 153-162. - doi: 10.3832/ifor0617-005

Academic Editor

Elena Paoletti

Paper history

Received: Nov 29, 2011
Accepted: May 11, 2012

First online: Jun 25, 2012
Publication Date: Jun 29, 2012
Publication Time: 1.50 months

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