The salt mining is located about 2 km from the city, in the salt massif of Valcele – Slatinele, at 240 m depth and represents, by the microclimate of salt, an important natural factor of cure used to treat respiratory diseases.
The main feature of the microclimate of the mine is the constancy of physical, chemical and microbiological parameters (without daily or seasonal variations), unlike outside air. The climatic parameters of Romanian's salt mining are temperature( approx. 12 ° - 13 °), relative humidity (approx. 60-80%), airflow speed reduced (almost imperceptible), air pressure is similar to the outside pressure or with little difference.
http://www.uvisitromania.com/tourist-attractions/bacau/salt-mine-of-targu-ocna-id573