MD80 FLC DEPLOYED THE PAX OXYGEN MASKS BECAUSE OF PRESSURIZATION PROBS.

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HAD LEVELED OFF AND HAD JUST TAKEN THE CART OUT TO BEGIN OUR BEVERAGE SVC. SVC IS COMPLETED FORWARD TO AFT; SO WE HAD JUST MOVED THE CART TO THE FRONT OF MAIN CABIN; AT ABOUT ROW 9. BOTH FLT ATTENDANT #4 AND MYSELF NOTICED A FOGGINESS IN THE CABIN. WE THEN BEGAN A DSCNT. THE OXYGEN MASKS DROPPED; WE ANGLED THE CART FOR SUPPORT; AND TOOK OXYGEN FROM THE NEAREST PAX SEATS. AT FIRST; NOT A SINGLE PAX DONNED THEIR MASKS. THOSE THAT TRIED; COMPLAINED THEY WERE RECEIVING NO OXYGEN BECAUSE THEIR BAG DID NOT INFLATE. WE ASSURED THEM THEY WERE. BOTH THE CAPT AND FLT ATTENDANT #1 MADE ANNOUNCEMENTS. THE MASK DEPLOYMENT WAS PRECAUTIONARY; BUT OXYGEN WAS AVAILABLE; IF NEEDED. WE RETURNED THE CART TO THE GALLEY; CHKING ON PAX AS WE MOVED TO THE BACK. WE HAD AN UNEVENTFUL LNDG BACK INTO ABQ; WE WERE BACK ON THE GND AT XA55 LCL. TOTAL AIRBORNE TIME WAS 1 HR. DEPLANED AND ACFT WAS TAKEN OTS. AFTERWARDS; THE CAPT SPOKE OF HAVING PROBS WITH MANY DIFFERENT THINGS. I BELIEVE: 1) HYDS; 2) THE COOLING/HEATING SYS; AND 3) PRESSURIZATION. THERE WERE NO INJURIES. DUE TO THE PRESSURIZATION PROBS; THE CAPT DEPLOYED THE OXYGEN MASKS AS A PRECAUTIONARY MEASURE.