What was found
FLT#1833, BOS-SFO. 'DESCENDING THROUGH 9500FT WE GOT A WEIRD SMELL IN FLIGHT DECK. ENGINES WERE AT IDLE APU WAS OFF. BOTH FO & 1 HAD A TASTE IN MOUTH AND FELT OFF. PROGRESSIVELY GOT WORSE ON APPROACH AND WE OPTED TO GET AIRCRAFT ON THE GROUND. WHILE TAXIING I FELT SLIGHTLY NAUSEOUS SO PUT ON O2 MASKS SEEMS THE EVENT WAS ISOLATED TO FLIGHT DECK; ACCOMPLISHED INFO NOTICES 2017-T015K SECTION B2 IDENTIFIED ODOR WAS TRANSIENT ENVIRONMENTAL FLIGHT PHASE TRANSITION. DECONTAMINATION LEVEL 3 WAS ACCOMPLISHED PER TSM 05-50-00-810-831-A. AIRCRAFT IS OF FOR SERVICES.'