Elevated FeNO, a marker of lower airway inflammation, was found in many students.
Signs of dampness in the classroom were related to airway infections among students.
Students in classrooms with signs of dampness had 31% higher FeNO values.
Higher quantities of DNA from Aspergillus versicolor were related to higher FeNO.
DNA from Aspergillus versicolor were related to asthma and respiratory symptoms.