(Salem, OR)  --  The director of Oregon's Department of Environmental Quality says he's stepping down.  Dick Pedersen says health concerns have led to his decision to leave the agency.  A spokesperson for Governor Kate Brown says Pedersen's decision to resign is not in response to southeast Portland's air-pollution issues that have been linked to two local glass manufacturers.  Brown says DEQ Deputy Director Joni Hammond will serve as interim director until a permanent successor can be appointed.