A320 FLT CREW HAS CABIN PRESSURIZATION PROBS; DECLARES EMER AND DIVERTS.

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WE WERE SCHEDULED ZZZ1-ZZZ2-ZZZ3-ZZZ4 IN THE SAME ACFT. ENRTE TO ZZZ3 WE DIVERTED FOR WX. CLBING OUT TO ZZZ3 WE GOT AN ECAM; AIR R WING LEAK. THIS WAS A NON EVENT FOR A 30 MIN FLT AT 12000 FT. I REMEMBERED THIS WAS A RECURRENT PROB IN THE HISTORY. I MADE A LONG ENTRY AND DEALT WITH THE WX ISSUES AT HAND. IN ZZZ3; CONTRACT MAINT MET US. HE WAS ALSO WORKING ANOTHER OF OUR FLTS. AFTER AN INSPECTION BELOW THE FUSELAGE; THE MECH FOUND A LEAK. HE WAS EXPLAINING THIS TO MAINT CTL ON THE PHONE AS I WAS PRESENT. MAINT CTL THEN EXPLAINED TO ME THIS WAS A PROB THAT 'HAPPENS ALL THE TIME.' HE SAID THIS WAS A L PACK ISSUE; BECAUSE IT LEAKS AT THE MANIFOLD AND CAUSES THE R SIDE ECAM. AFTER FURTHER REVIEW; THE L PACK WAS DEFERRED. CLBING OUT OF ZZZ3; WE HAD THE SAME ECAM. MY FO CALLED MAINT CTL ON RADIO #2 WHILE I LEVELED AT FL220 TO AVOID ICING. WE SWITCHED DUTIES SO I COULD WORK THE PROB. I REALIZED WE HAD NO PACKS. THE CABIN ALT WAS AT 6700 FT AND CLBING QUICKLY. L PACK WAS DEFERRED AND ECAM SHUT OFF R BLEED. I ASKED MAINT CTLR IF HE AGREED WITH TURNING ON L PACK SINCE IT APPARENTLY WAS NOT THE PROB. HE SAID IT WOULD TAKE CAPT EMER AUTH. I SIMULTANEOUSLY TOLD THE FO TO GET US DOWN TO 10000 FT. ATC GAVE US ONLY 12000 FT. FO ASKED IF HE SHOULD DECLARE AN EMER. I SAID YES. HE INFORMED ATC WE WERE GOING TO 10000 FT. WE PUT ON OUR MASKS AS A CAUTION. THERE WAS NO RAPID D AND THE MASKS DID NOT DEPLOY. WE DSNDED AT A QUICK BUT NORMAL RATE. I ELECTED TO TURN ON THE L PACK. PRESSURIZATION BECAME NORMAL AS WE LEVELED AT 10000 FT. THE CABIN REACHED A MAX AT APPROX 7500 FT AS WE WERE DSNDING. I BRIEFED THE PURSER; PAX; AND MADE CONTACT WITH DISPATCH AND MAINT CTL. I PASSED ALONG OUR EMER. THE DECISION WAS MADE TO DIVERT TO ZZZ. THE STATUS OF THE BLEEDS/PACKS WAS QUESTIONABLE DUE TO A POSSIBLE LEAK. THIS WAS THE SAFEST COURSE OF ACTION. THE L PACK DID MAKE A BURNING/OVERHEAT SMELL ON FINAL. I ELECTED TO TURN IT BACK OFF. THE FIRE TRUCKS MET US AS A PRECAUTION.