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L'ozone est-il notre ami ? En haute altitude, la couche d'ozone est essentielle : elle absorbe les rayons UV et protège la vie sur Terre. Mais au niveau du sol, c'est un gaz polluant, issu des activités humaines, nocif pour nos poumons et néfaste pour les plantes, qui s'accumule dans l'air que l'on respire. Jérémy t'explique cette dualité ...
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