The specific climatic conditions in the town ensure that the air is exceedingly pure. This is one of the main factors that make Kynžvart the foremost Czech spa specialising in the treatment of respiratory illnesses in children. The spa, which has four mineral springs, was founded by the Metternich family in the middle of the 19th century after an analysis of local mineral springs and climatic conditions had been carried out. An important turning point in the history of the spa was the year 1950 when the remarkable healing effects of the local climate were discovered during a whooping cough epidemic. Since then the spa has specialised in the treatment of children between the ages of 2 and 15. Treatment was eventually expanded to include that of allergic skin diseases and, because of the suitability of the water, the treatment of kidney and urinary tract diseases in children and teenagers.