Catalyzes the hydrolysis of pseudosubstrates such as p- nitrocatechol sulfate and p-nitrophenyl sulfate (PubMed:23986440). Catalyzes the hydrolysis of the 2-sulfate groups of the 2-O-sulfo-D- glucuronate residues of chondroitin sulfate, heparin and heparitin sulfate (PubMed:28055182, PubMed:34916232). Acts selectively on 2- sulfoglucuronate and lacks activity against 2-sulfoiduronate (PubMed:28055182). {ECO:0000269|PubMed:23986440, ECO:0000269|PubMed:28055182, ECO:0000269|PubMed:34916232}. This is the function of ENSG00000164291 (ARSK, arylsulfatase family member K).