TY CONF TI POSSIBILITY OF DIAGNOSING DISEASES BY THE RATIO OF CONCENTRATIONS OF GASES IN EXHALED AIR KW photoacoustic gas analyzer KW carbon dioxide KW ammonia JO The XXXI International Symposium "Atmospheric and Ocean Optics. Atmospheric Physics" AU Ageev, B.G. AU Nikiforova, O.Y. PY 2025 PB V.E. Zuev Institute of Atmospheric Optics, Siberian Branch of the Russian Academy of Sciences