Sick building syndrome–clinical features 
 Hypersensitivity Hypersensitivity pneumonitis and allergic alveolitis in response to various microorganisms eg water-borne ameba, known as 'humidifier lung' 
 Allergies Allergic rhinitis and asthma, due to dust mites 
 Infections Mini-epidemics, eg Legionnaire's disease, Pontiac fever, by low-level airborne pathogens that thrive in stagnate water and are disseminated through poorly-maintained air conditioning systems 
 Mucocutaneous irritation Skin eruptions, due to fiberglass, mineral wool or other particles; contact lens wearers may suffer corneal abrasions 
 Mucosal irritation Dry throat, cough, tightness in chest, sinus congestion and sneezing–formerly due to tobacco smoke, which is increasingly banned in buildings, solvents and cleaning materials, eg chlorine, reactions to photochemicals or other toxins, eg in laser printers due to the styrene-butadiene toners and ozone production by photocopiers 
 Pseudoepidemics Due to 'mass hysteria'