N2 is a nitrogen MOLECULE, N is an atom. As you pointed out it got an affinity with bonding to something. THAT is what causes trouble, the bonding might break a molecule you need for something else, or the broken molecule may now be poisonous, or the new molecule with the N2 becomes poisonous.
A common fertilizer, KNO3 is kind of good at letting go of that O3 if something more appealing comes along and releasing pent up energy in the process. Making some of these combinations can land you in jail in the USA and probably other places.