Narrative:

The next day in ZZZ, when all crew members gathered together in hotel lobby for van drive back to airport, one of the flight attendants was particularly concerned, because she was experiencing unusual breathing, possibly due to asthma. This got the whole crew talking and discussing the effects of high altitude due to ZZZ being 5440 ft above sea level. The captain also mentioned that he was surprised, because he is usually able to run 3 mi in ZZZ, but felt short winded and only ran 1 mi. Later that day, I discovered that we were possibly exposed to an excess ozone concentration the night before on our arrival flight into ZZZ. Ozone is a lung irritant and could explain crew's complaints. We flew our flight plan as company dispatched at FL410. My discovery was that the maximum altitude that should have been flown for that route was FL390, as published in company's flight operations manual. Both of our companies' manuals, the flight operations manual and flight standards manual, state that it is the aircraft dispatcher's responsibility to ensure that far 25.832 will be complied with, and that the aircraft dispatcher will not flight plan flts that will exceed cabin ozone concentration limits and aircraft limits. Even though both these manuals state that it is a dispatcher's function, to ensure that this does not happen again, in the future, I will follow up with appropriate charts to verify that this limitation will not be exceeded and share the findings with the captain.

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Original NASA ASRS Text

Title: CL65 FLC OPERATES ACFT AT ALT HAVING HIGH OZONE CONCENTRATION LEVELS.

Narrative: THE NEXT DAY IN ZZZ, WHEN ALL CREW MEMBERS GATHERED TOGETHER IN HOTEL LOBBY FOR VAN DRIVE BACK TO ARPT, ONE OF THE FLT ATTENDANTS WAS PARTICULARLY CONCERNED, BECAUSE SHE WAS EXPERIENCING UNUSUAL BREATHING, POSSIBLY DUE TO ASTHMA. THIS GOT THE WHOLE CREW TALKING AND DISCUSSING THE EFFECTS OF HIGH ALT DUE TO ZZZ BEING 5440 FT ABOVE SEA LEVEL. THE CAPT ALSO MENTIONED THAT HE WAS SURPRISED, BECAUSE HE IS USUALLY ABLE TO RUN 3 MI IN ZZZ, BUT FELT SHORT WINDED AND ONLY RAN 1 MI. LATER THAT DAY, I DISCOVERED THAT WE WERE POSSIBLY EXPOSED TO AN EXCESS OZONE CONCENTRATION THE NIGHT BEFORE ON OUR ARR FLT INTO ZZZ. OZONE IS A LUNG IRRITANT AND COULD EXPLAIN CREW'S COMPLAINTS. WE FLEW OUR FLT PLAN AS COMPANY DISPATCHED AT FL410. MY DISCOVERY WAS THAT THE MAX ALT THAT SHOULD HAVE BEEN FLOWN FOR THAT RTE WAS FL390, AS PUBLISHED IN COMPANY'S FLT OPS MANUAL. BOTH OF OUR COMPANIES' MANUALS, THE FLT OPS MANUAL AND FLT STANDARDS MANUAL, STATE THAT IT IS THE ACFT DISPATCHER'S RESPONSIBILITY TO ENSURE THAT FAR 25.832 WILL BE COMPLIED WITH, AND THAT THE ACFT DISPATCHER WILL NOT FLT PLAN FLTS THAT WILL EXCEED CABIN OZONE CONCENTRATION LIMITS AND ACFT LIMITS. EVEN THOUGH BOTH THESE MANUALS STATE THAT IT IS A DISPATCHER'S FUNCTION, TO ENSURE THAT THIS DOES NOT HAPPEN AGAIN, IN THE FUTURE, I WILL FOLLOW UP WITH APPROPRIATE CHARTS TO VERIFY THAT THIS LIMITATION WILL NOT BE EXCEEDED AND SHARE THE FINDINGS WITH THE CAPT.

Data retrieved from NASA's ASRS site as of July 2007 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.