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'