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A stratified random sampling design was adopted to contrast sites with different ozone exposure levels (≤18,000 and >18,000μgm −3 h) in order to define whether and to what extent a relationship exists between potential risk (estimated by exposure to ozone) and the response of Viburnum lantana L. in terms of foliar symptoms. The study was designed over a meso-scale (6200km 2 ), carried...
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