NASA's National Aeronautics and Space Administration (NASA) is seeking to procure 60 EnSci Electrochemical Concentration Cell (ECC) ozonesondes, which are critical for maintaining long-term balloon-borne ozone profile records essential for satellite validation and climate studies. The procurement will be conducted as a sole source contract with JH Acquisitions, LLC, the manufacturer of the existing ozonesondes, ensuring compatibility with current NASA equipment. The ozonesondes will be utilized at the Nairobi SHADOZ station, with operations expected to run from September 2025 through August 2026, facilitating ongoing monitoring of ozone and pollution trends vital for environmental research. Interested organizations must submit their capabilities and qualifications to the designated contacts by 4:00 p.m. Eastern Standard Time on March 14, 2025, to be considered for this procurement.