B757-200 DIVERTS DUE TO ODORS OF UNKNOWN ORIGIN.

Narrative

SHORTLY AFTER TKOF; FLT ATTENDANTS CALLED FROM AFT OF ACFT AND SAID THEY SMELLED SOMETHING LIKE HOT LINT FROM A CLOTHES DRYER AND SOME HAZE IN THE CABIN. I TOLD THE FLT ATTENDANTS THAT WE DEPARTED THROUGH A CLOUD/WILDFIRE SMOKE LAYER AT ABOUT 1500 FT AGL AND TO GIVE A LITTLE TIME TO SEE IF SMELL WOULD GO AWAY. FLT ATTENDANTS CALLED BACK AND SAID SMELL WENT AWAY AND EVERYTHING NORMAL. I MADE A PA AND EXPLAINED TO SOME CONCERNED PAX THAT WE FLEW THROUGH SOME WILDFIRE SMOKE FROM THE LCL AREA FIRES. WE THEN PRESSED ON TO ZZZ1. AFTER ABOUT 30 MINS; THE FLT ATTENDANTS CALLED BACK AND SAID FUMES WERE BACK IN CABIN AT ABOUT ROW 23 ON BACK; BUT NO SMOKE/HAZE. FLT ATTENDANTS SAID SMELL WAS MORE INTENSE. WE ELECTED TO DECLARE EMER AND DIVERT TO ZZZ2; TOLD CTR THAT WE WERE CARRYING HAZMAT IN FORWARD CARGO AND ASKED THEM TO NOTIFY DISPATCH AND ALSO HAVE CFR STANDING BY AT ZZZ2. ON APCH; I ASKED FLT ATTENDANTS OF CABIN CONDITION AND THEY RPTED EVERYTHING NORMAL. WE THEN HAD FIRE CAPT FOLLOW US TO GATE AND AGAIN TOLD THEM OF HAZMAT IN FORWARD CARGO. AWAITING JETBRIDGE AND DOOR; I MADE PA AND RELAYED TO PAX THAT FIRE CAPT RPTED EVERYTHING APPEARS NORMAL. I TOLD PAX TO KEEP BOARDING PASS AND PROCEED UP JETBRIDGE TO LOUNGE AND AWAIT FURTHER INSTRUCTIONS FOR THE FLT. AS PAX STARTED TO DEPLANE; FIRE CAPT HALTED DEPLANING TEMPORARILY TO SET UP A SECURE PERIMETER IN TERMINAL. PAX DEPLANED. ACFT WAS TAKEN OTS. WE GOT NEW PLANE AND FLEW TO ZZZ1.