Narrative:

Took off from ord. Flight attendant called, said she smelled something unusual. We also smelled air conditioning (dirty pack). Flight attendant said that some passenger felt ill from the fumes. We returned to ord to have the pack looked at, did not feel an emergency situation existed, but company declared one for us. Landed uneventfully. Supplemental information from acn 587464: after takeoff roll, we noticed a haze in cockpit. While accomplishing QRH procedures, the haze dissipated and flight attendants concurred the situation in the back was the same, although some passenger were complaining of headache and nausea. I notified dispatch of our return to ord, as well as ramp control.

Google
 

Original NASA ASRS Text

Title: RETURN AND LAND MANDATED TO AN MD80 FLT CREW WHEN AN INTERIOR HAZE IS ACCOMPANIED BY A NAUSEOUS OILY SMELL THAT SICKENED SOME PAX JUST AFTER TKOF FROM ORD, IL.

Narrative: TOOK OFF FROM ORD. FLT ATTENDANT CALLED, SAID SHE SMELLED SOMETHING UNUSUAL. WE ALSO SMELLED AIR CONDITIONING (DIRTY PACK). FLT ATTENDANT SAID THAT SOME PAX FELT ILL FROM THE FUMES. WE RETURNED TO ORD TO HAVE THE PACK LOOKED AT, DID NOT FEEL AN EMER SIT EXISTED, BUT COMPANY DECLARED ONE FOR US. LANDED UNEVENTFULLY. SUPPLEMENTAL INFO FROM ACN 587464: AFTER TKOF ROLL, WE NOTICED A HAZE IN COCKPIT. WHILE ACCOMPLISHING QRH PROCS, THE HAZE DISSIPATED AND FLT ATTENDANTS CONCURRED THE SIT IN THE BACK WAS THE SAME, ALTHOUGH SOME PAX WERE COMPLAINING OF HEADACHE AND NAUSEA. I NOTIFIED DISPATCH OF OUR RETURN TO ORD, AS WELL AS RAMP CTL.

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.