Here is the story of Avherald
http://www.avherald.com/h?article=43a42f9d&opt=0An American Airlines Boeing 737-800, registration N913AN performing flight AA-547 from Washington National,DC to Chicago O'Hare,IL (USA) with 134 passengers and 6 crew, stopped climb out of Washington at FL280 due to complaints about bad quality of cabin air but continued towards Chicago.
and
The airport reported that passengers had complained about bad quality of air on board. At least one person started to suffer from asthma, five needed medical attention, some but not all of them were taken to a hospital.