( 2 ) By the later of January 1 , 2009 or the date on which the unit commences operation , theowner or operator of each affected unit under subpart 2 of part B shall install and operate CEMS , quality assure the data , and keep records and reports in accordance with the regulations issued under paragraph ( a ) ( 2 ) with regard to sulfur dioxide , opacity , and volumetric flow .
The owner of each unit should install and operate CEMS to affect sulfur dioxide in the air .