Atmospheric Ozone Dynamics and Air Quality Assessment
Summary
Atmospheric ozone, a trace gas present in both the stratosphere and the troposphere, exerts critical influence on climate, human health and ecosystem function. In the stratosphere, it forms a protective layer that absorbs harmful ultraviolet radiation, while in the lower atmosphere it governs oxidative capacity and secondary pollutant formation. Tropospheric ozone arises principally from photochemical reactions between nitrogen oxides (NOx) and volatile organic compounds (VOCs) under solar radiation. Natural processes—including biogenic emissions, lightning and stratosphere–troposphere exchange—combine with anthropogenic sources such as fossil fuel combustion and biomass burning to determine spatio-temporal distributions. Meteorological factors, notably temperature, humidity, cloud cover and atmospheric stability, modulate ozone production, transport and deposition. Ozone concentrations also respond to large-scale circulations, seasons and climate variability, exemplified by monsoon dynamics in tropical regions and stratospheric intrusions in mid-latitudes. Evaluation of ozone relative to air quality standards employs in situ observations, remote sensing instruments and chemical transport models, enabling both diagnostic assessment and projection of future scenarios. Integrated approaches to air quality assessment increasingly link ozone with co-pollutants such as particulate matter, carbon monoxide and secondary aerosols. As urbanisation, emission controls and climate change alter precursor emissions and atmospheric conditions, understanding ozone dynamics remains vital for public health, ecosystem integrity and the development of effective mitigation strategies.
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Atmospheric Ozone Dynamics and Air Quality Assessment publication trend
The graph below shows the total number of articles in atmospheric ozone dynamics and air quality assessment across all publications each year (not limited to Nature Index journals).
Technical terms
Tropospheric ozone: Ozone present in the lowest atmospheric layer, acting as a pollutant and greenhouse gas.
Nitrogen oxides (NOx): Reactive gases (NO and NO₂) emitted from combustion processes, key precursors to ozone formation.
Volatile organic compounds (VOCs): Organic gases emitted from natural and anthropogenic sources that participate in photochemical reactions.
Chemical transport model: Numerical model simulating the emission, chemical transformation and transport of atmospheric species.
Photolysis: Chemical decomposition induced by absorption of sunlight, essential for initiating ozone formation.
Aerosol optical depth (AOD): Measure of the extinction of solar radiation by airborne particles, affecting photolysis rates.
References
- Lower tropospheric ozone over India and its linkage to the South Asian monsoon. Atmospheric Chemistry and Physics (2018).
- Effects of business-as-usual anthropogenic emissions on air quality. Atmospheric Chemistry and Physics (2012).
- Avoiding high ozone pollution in Delhi, India. Faraday Discussions (2021).
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