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November 30, 2025Atmospheric chemistry and physicsOpen Access

A nitrate photolysis source of tropospheric HONO is incompatible with current understanding of atmospheric chemistry

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Overview

Observational analysis shows rising nitrous acid levels in the remote troposphere, indicating significant impacts on atmospheric chemistry and climate consequences.

Key Points

  • Tropospheric nitrous acid levels rose, impacting air quality and climate significantly.
  • HONO concentrations increased beyond known sources, with a global NOx increase of around 48 Tg N yr−1.
  • Laboratory modeling assessed nitrate aerosol photolysis effects on atmospheric chemistry using GEOS-Chem simulations.
  • Air quality implications suggest a critical need for improved measurement techniques and understanding nitrate photolysis.

Cite This Study

A 2025 study studied this question.

synapsesocial.com/papers/692b9da01d383f2b2a37a2e6https://doi.org/10.5194/acp-25-16945-2025
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