TY - ABST Y1 - Submitted A1 - Goumenaki, E. A1 - Fernandez, I. G. A1 - Papanikolaou, A. A1 - Papadopoulou, D. A1 - Askianakis, C. A1 - Kouvarakis, G. A1 - Barnes, J. KW - af(st)y KW - air-pollution KW - aot40 KW - critical flux versus exposure KW - exposure indexes KW - gas-exchange KW - lettuce KW - plants KW - protect vegetation KW - responses KW - spring wheat KW - standard KW - stomatal conductance KW - white clover ER -