This enzyme belongs to the family of oxidoreductases, specifically those acting on paired donors, with O2 as oxidant and incorporation or reduction of oxygen.

The enzyme belongs to the family of oxidoreductases, specifically those acting on single donors with O as oxidant and incorporation of two atoms of oxygen into the substrate (oxygenases).

NO dioxygenase belongs to the family of oxidoreductases, more specifically those acting on paired donors, with O as oxidant and with incorporation of two atoms of oxygen into the other donor.

EC 1.13 includes oxidoreductases that act on single donors with incorporation of molecular oxygen (oxygenases)