. Lung function test. Asthmatic man breathes hard into a spirometer, while a doctor reads the graph being produced. It is believed his industrially-induced asthma is caused by spray paint, constricting airways in the lungs (broncho- spasm) and making breathing difficult. The spirometer measures total volume of air breathed out (forced vital capacity) and expiratory volume after 1 second. The patient will then be subjected to paint-spray tests and his lung function taken again to establish the severity of asthma. Bron- chodilator drugs may be prescribed as a treatment. Photographed at the National Heart and Lung Institute, London. MODEL RELEASED

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