Narrative:

Cabin crew got lightheaded and dizzy; followed by pax same; spread from aft to whole cabin. No odor; fume detected. Multiple cabin crew and pax had symptoms. Decision to make a cautionary divert.established at FL320; got call from aft cabin flight attendant that two of them were feeling lightheaded and dizzy; we agreed to cool down cabin and told them to keep us informed; less than five minutes later we got another call that some passengers also were feeling lightheaded and dizzy; we called [maintenance] and dispatch on conference call and all agreed that aircraft was nominal and we'd continue to monitor while thinking of a possible divert; less than fifteen minutes since initial call we also got a call from the purser that the entire cabin crew were also getting lightheaded and feeling dizzy.the decision to divert [was] made and we called the international relief officer (international relief officer) back to the cockpit from his break; ATC gave us expedited handling to ZZZZ where an overweight landing was made following the 'cabin air quality procedure' and 'overweight landing' procedure as well as normal approach and landing. First officer (first officer) was directed to don oxygen mask as the flying pilot as part of normal ZZZZ procedure.landed rolled to end of runway using reverse and min braking to minimize heating of brakes. After exterior inspection by fire and rescue we taxied unassisted to [the stand] where we were met by emt who took care of affected crew members and passengers; aircraft handed over to maintenance and flight crew went to the hotel.

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Original NASA ASRS Text

Title: B767 flight crew reported that the quality of air in the cabin caused the cabin crew and some passengers to become light headed and ill. The ozone converter was reportedly a contributing factor in the event.

Narrative: Cabin crew got lightheaded and dizzy; followed by pax same; spread from aft to whole cabin. No odor; fume detected. Multiple cabin crew and pax had symptoms. Decision to make a cautionary divert.Established at FL320; got call from aft cabin Flight Attendant that two of them were feeling lightheaded and dizzy; we agreed to cool down cabin and told them to keep us informed; Less than five minutes later we got another call that some passengers also were feeling lightheaded and dizzy; We called [maintenance] and Dispatch on conference call and all agreed that aircraft was nominal and we'd continue to monitor while thinking of a possible divert; less than fifteen minutes since initial call we also got a call from the purser that the entire cabin crew were also getting lightheaded and feeling dizzy.The decision to divert [was] made and we called the IRO (International Relief Officer) back to the cockpit from his break; ATC gave us expedited handling to ZZZZ where an overweight landing was made following the 'Cabin Air Quality procedure' and 'overweight Landing' procedure as well as normal approach and landing. F/O (First Officer) was directed to don oxygen mask as the flying pilot as part of normal ZZZZ procedure.Landed rolled to end of RWY using reverse and min braking to minimize heating of brakes. After exterior inspection by Fire and Rescue we taxied unassisted to [the stand] where we were met by EMT who took care of affected crew members and passengers; aircraft handed over to maintenance and flight crew went to the hotel.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.