[To much nitrogen, aci and ozone: pollutant immissions are over the critical threshold]. | Trop d'azote, d'acide et d'ozone: les immissions polluantes depassent le seuil critique.

abonos nitrogenados acid deposition air pollution application rates arbre forestier bosques dose d'application ecosistema ecosystems estres forest trees forests nitrogen fertilizers ozone ozono stress suisse suiza switzerland