Volatile Organic Compounds and Ozone Formation Dynamics
Summary
Volatile organic compounds (VOCs) encompass a diverse group of carbon‐containing gases emitted from both natural and anthropogenic sources. Once released into the lower atmosphere, VOCs undergo photochemical oxidation driven by sunlight and reactive radicals, chiefly the hydroxyl radical (OH). This oxidation sequence generates intermediate products and peroxy radicals that react with nitrogen oxides (NOx) to form ozone (O₃). The rate and yield of ozone production depend on VOC speciation, VOC : NOx ratios and meteorological factors such as temperature, solar irradiance and atmospheric stability. In VOC-rich environments with limited NOx, ozone formation follows a NOx-limited regime, whereas in NOx-rich settings it becomes VOC-limited. Secondary organic aerosols (SOA) also arise from VOC oxidation, influencing both particle formation and ozone chemistry. Control strategies targeting high-reactivity VOCs and coordinated NOx reductions are crucial for mitigating ground-level ozone pollution, which poses risks to human health, ecosystems and climate through altered radiative balance and oxidant budgets.
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Volatile Organic Compounds and Ozone Formation Dynamics publication trend
The graph below shows the total number of articles in volatile organic compounds and ozone formation dynamics across all publications each year (not limited to Nature Index journals).
Technical terms
Volatile organic compounds (VOCs): Carbon-based gases that readily vaporise into the atmosphere and participate in photochemical reactions.
Non-methane volatile organic compounds (NMVOCs): The subset of VOCs excluding methane, often the focus of emission inventories due to their high reactivity.
Ozone formation potential (OFP): A metric quantifying the capacity of individual VOC species or mixtures to produce ozone under specified conditions.
NOx-limited regime: A photochemical regime in which ozone production is constrained by the availability of nitrogen oxides.
VOC-limited regime: A photochemical regime in which ozone production is constrained by the availability of reactive VOCs.
References
- The contribution of industrial emissions to ozone pollution: identified using ozone formation path tracing approach. npj Climate and Atmospheric Science (2023).
- Persistent growth of anthropogenic non-methane volatile organic compound (NMVOC) emissions in China during 1990–2017: drivers, speciation and ozone formation potential. Atmospheric Chemistry and Physics (2019).
- Contributions of different anthropogenic volatile organic compound sources to ozone formation at a receptor site in the Pearl River Delta region and its policy implications. Atmospheric Chemistry and Physics (2019).
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