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<p>Atmospheric ammonia (NH<sub>3</sub>) is a critical environmental contaminant impacting ecosystem integrity and human health. In Australia, while anthropogenic sources are well-characterized, the contribution of wildfires to NH<sub>3</sub> pollution remains poorly quantified. This study presents a high-resolution (0.25°) assessment of wildfire-induced NH<sub>3</sub> concentrations across the whole Australia from July 2022 to December 2024, derived from chemical transport model simulations constrained by satellite fire observations. Analysis of warm seasons (September-February) reveals that wildfires dominated atmospheric NH<sub>3</sub> contamination, contributing over 80% of total concentrations during major fire events. These findings highlight wildfires as a critical episodic source of reactive nitrogen pollution with significant implications for air quality toxicology, ecosystem eutrophication, and public health exposure in fire-prone regions.</p>

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Wildfire Dominates Spatio-Temporal Patterns of Ammonia Concentrations in Australia During the Warm Season

  • 期刊论文

  • 发表日期：

    2026年5月18日

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  • Qingmei Wang,
  • Ligang Wang

摘要

Atmospheric ammonia (NH3) is a critical environmental contaminant impacting ecosystem integrity and human health. In Australia, while anthropogenic sources are well-characterized, the contribution of wildfires to NH3 pollution remains poorly quantified. This study presents a high-resolution (0.25°) assessment of wildfire-induced NH3 concentrations across the whole Australia from July 2022 to December 2024, derived from chemical transport model simulations constrained by satellite fire observations. Analysis of warm seasons (September-February) reveals that wildfires dominated atmospheric NH3 contamination, contributing over 80% of total concentrations during major fire events. These findings highlight wildfires as a critical episodic source of reactive nitrogen pollution with significant implications for air quality toxicology, ecosystem eutrophication, and public health exposure in fire-prone regions.