A B757 FLT ATTENDANT RPTED THAT DURING A FLT FROM MBJ TO MIA THE CAPT MADE AN EMER DSCNT DUE TO PRESSURIZATION FAILURE AND THE PRESENCE OF FUMES.

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SMELLED LIKE WHEN THE HEAT OF CABIN COMES ON. I CALLED THE CAPT TO LET HIM KNOW. HE SAID HE WOULD GET BACK TO ME. WHEN HE CALLED; HE TOLD US TO MAKE SURE EVERYBODY WAS BUCKLED UP AND FOR US TO TAKE OUR SEATS. THERE WAS A PROB WITH PRESSURIZATION OF CABIN. WE NOTICED WE WERE LOSING ALT RAPIDLY AND THEN THE OXYGEN MASKS CAME DOWN. WE INSTRUCTED EVERYBODY TO PUT MASKS ON AND STAY ON OXYGEN UNTIL ADVISED. I GOT UP FROM MY JUMPSEAT AND WENT FROM SEAT TO SEAT TO MAKE SURE EVERYBODY WAS ON OXYGEN; GOING FROM MASK TO MASK. I CAME BACK TO MY SEAT AND CAPT TOLD US WE COULD TAKE OXYGEN OFF. WE LANDED FAR FROM ARPT BECAUSE; BESIDES THE SMELL FROM CANISTERS FROM DEPLOYMENT OF MASKS; THERE WAS AN ELECTRICAL SMELL. SO. FIRE DEPT CHKED THE ACFT OUTSIDE; THEN WE PULLED IN AND DEPLANED. PARAMEDICS WERE WAITING FOR PAX AND CREW. ONE OF THE FLT ATTENDANT'S EARS WAS BLOCKED AND SHE WAS IN PAIN. SOME PAX COMPLAINED OF EAR TROUBLE AND PAIN. WE WERE OK THROUGH THIS EVENT; BUT THEN WE WERE SHAKING AND NERVOUS.