California Floats Airborne 1,4-DCB Risk Levels Amid Ongoing TSCA Review

California’s health hazard office is proposing more stringent risk exposure levels for the multi-use chlorinated chemical 1,4-Dichlorobenzene (1,4-DCB) for use in the state’s air toxics “hot spots” program, even as EPA is continuing work on a long-delayed TSCA risk evaluation for the same compound. The Office of Environmental Health Hazard Assessment (OEHHA) on Nov. 29 announced the availability of a draft technical document for a 45-day public review that summarizes the noncancer reference exposure levels (RELs) for 1,4-DCB. OEHHA plans...