AN MD80 CREW; WHILE TAXIING FOR TKOF AT ATL; EXPERIENCED SMOKE AND FUMES IN THE CABIN.

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WHILE TAXIING FOR DEP ON RWY 26L IN ATL; WE WERE ALMOST TO THE TOP OF THE HILL ON TXWY E WHEN I INSTRUCTED THE FO TO MAKE HIS PREDEP ANNOUNCEMENT. AS HE WAS ON THE PA; THE FLT ATTENDANT CHIME STARTED RINGING CONTINUOUSLY AND WAS RESPONDED TO BY THE FO. AS I WAS LISTENING TO THE COM FROM THE CABIN; I HEARD ONE OF THE FLT ATTENDANTS SAY THAT THERE WAS SMOKE AND FUMES COMING FROM THE VENTS AND THAT PAX WERE HAVING DIFFICULTY BREATHING. I STOPPED THE ACFT TO ASSESS THE SIT. I TOLD THE FO TO HAVE THE FLT ATTENDANTS BE PREPARED TO EVAC THE ACFT. I CALLED THE TWR AND ADVISED THAT WE WERE STOPPING THE ACFT AND THAT WE WOULD BE EVACING THE ACFT. THE FLT ATTENDANT ADVISED THAT THE FUMES SMELLED LIKE PLASTIC BURNING AND I COULD HEAR PAX YELLING IN THE BACKGND. I COVERED THE APPROPRIATE ITEMS IN THE SMOKE AND FUMES CHKLIST AND ACCOMPLISHED THE EVAC CHKLIST EXCEPT FOR DISCHARGING THE FIRE BOTTLES. I THEN ANNOUNCED TO THE PAX THAT WE WERE GOING TO EVAC AND FOR THEM TO CAREFULLY FOLLOW THE FLT ATTENDANT'S INSTRUCTIONS. I THEN GAVE THE COMMAND TO EVAC. SUPPLEMENTAL INFO FROM ACN 558131: THE FIRST; OR ONE OF THE FIRST; PEOPLE OUT OF THE DOOR AND DOWN A SLIDE SUSTAINED MINOR CUTS ON HER FACE WHEN SHE SLID FACE-FIRST AFTER CATCHING HER SHOES ON THE TOP OF THE SLIDER. I MADE ONE MORE CALL TO GND AND ENSURED THE EMER CREWS WERE ENRTE; WHICH THEY WERE. 116 PAX; 3 FLT ATTENDANTS; AND LASTLY 2 PLT EVACED THE ACFT WITH EMER PERSONNEL PRESENT. APPARENTLY; FROM FIRST RPTS ON THE SCENE; THE APU HAD INGESTED SOME HYD FLUID AND THIS WAS CAUSING THE SMOKE.