Atmospheric Measurement Techniques
Atmospheric Measurement Techniques
AMT
Articles | Volume 18, issue 13
Articles | Volume 18, issue 13
https://doi.org/10.5194/amt-18-3135-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-18-3135-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 18, issue 13
Research article
 | 
15 Jul 2025
Research article |  | 15 Jul 2025

Retrieval of bulk hygroscopicity from PurpleAir PM2.5 sensor measurements

Jillian Psotka, Emily Tracey, and Robert J. Sica

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Short summary
PurpleAir sensors provide a low-cost way to monitor air quality, with over 30 000 sensors available worldwide. However, their measurements require calibration with trusted data for accuracy. Our new technique builds on previous calibration methods by also enabling the measurement of a quantity related to how pollutants grow with humidity. Mapping this new quantity will improve air quality forecasting.
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