Atmospheric Measurement Techniques
Atmospheric Measurement Techniques
AMT
Articles | Volume 19, issue 14
Articles | Volume 19, issue 14
https://doi.org/10.5194/amt-19-4815-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-19-4815-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 14
Research article
 | 
28 Jul 2026
Research article |  | 28 Jul 2026

A small-footprint Cavity Ring-Down Spectroscopy instrument for in situ measurements of NO3 and N2O5

Gunther N. T. E. Türk, Simone T. Andersen, Patrick Dewald, Jan Schuladen, Jos Lelieveld, and John N. Crowley

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Short summary
We built a small instrument to measure the air-borne molecules NO₃ and N₂O₅. These originate mostly from human-made nitrogen oxide emissions and are important for nighttime chemistry and air quality. Our instrument is lightweight and sensitive, detecting these molecules at levels below one part per trillion. Tests in the laboratory and during a field study show its ability to accurately measure these trace gases. Here, we present the design of the instrument and discuss its performance.
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