Involved in the naphthalene catabolic pathway. Catalyzes the meta-cleavage of 1,2-dihydroxynaphthalene (1,2-DHN) to yield 2-hydroxychromene-2-carboxylic acid (By similarity). naphthalene-1,2-diol + O2 = 2-hydroxychromene-2-carboxylate + H(+) Aromatic compound metabolism; naphthalene degradation. Encoded on an unnamed 75 kb plasmid. Belongs to the extradiol ring-cleavage dioxygenase family.