Title: Air pollution and forests
Subjects: Air, Effect of air pollution on Plants, Environmental aspects, Forest ecology, Pollution, Plants, Ecologie des forets, Hatas, Okologia, Ecologie forestiere, Effect of air pollution on, Atmosphere, Legszennyezes, Kornyezet, Plantes, Effets de la pollution de l'air sur les, Effets de la pollution sur les Plantes, Forets, Erdok, Noveny, Protection, Aspect de l'environnement, Pluies acides, Air, pollution, Plants, effect of pollution on