Air you can feel
Fresh mountain air, rich in negative ions
The lakes lie in the 1,200–1,600 m belt that Bulgarian scientists describe as especially favourable for people. Mountain breezes, forests and open water keep the air clean and rich in negative (light) air ions – physicists cite 600 to 6,000 negative ions per cm³ as the most beneficial range, with the highest values in the mornings and evenings. It is why the Smolyan Lakes have long been known as a place to rest, recover and recharge, and why they are counted among the best places on the Balkans for fresh air.
Source: Bulgarian National Radio, “Smolyan Lakes heal and rejuvenate”.