Aerosol-Atmosphere Interactions and Air Quality Management

Aerosols—suspended solid or liquid particles within the atmosphere—play a central role in air quality, weather and climate processes. Their interactions with solar radiation and cloud microphysics regulate the planetary boundary layer (PBL) dynamics, influencing surface‐level pollutant dispersion and intensity of haze or smog episodes. Absorbing aerosols such as black carbon heat atmospheric layers and stabilise the PBL, suppressing turbulence and trapping pollutants near the surface. Scattering particles reduce surface radiation, altering convective heat fluxes and modifying diurnal PBL evolution. These feedbacks can amplify pollution under stagnant conditions, especially in densely populated or industrialised regions. Effective air quality management thus depends on understanding aerosol radiative effects, size distribution and chemical composition, as well as their coupling to meteorology. Mitigation strategies targeting key aerosol sources—including combustion‐derived particles and secondary aerosol precursors—can yield co‐benefits for human health and climate by weakening adverse boundary‐layer feedbacks, enhancing dispersion and lowering net radiative forcing.

Research from Nature Portfolio

Recent analyses reveal that rising carbon dioxide concentrations may enhance turbulent mixing by warming the surface, counteracting the boundary‐layer stabilisation induced by absorbing aerosols such as black carbon. Projections suggest that regions currently experiencing severe pollution could see up to a 10 % reduction in extreme pollution episodes as boundary‐layer height increases under high-CO₂ scenarios and lower aerosol emissions. Earlier foundational work demonstrated a positive feedback between particulate matter accumulation and boundary‐layer suppression in urban environments, quantifying how high particulate concentrations reduce mixing heights and further elevate PM levels during severe episodes.

Aerosol-Atmosphere Interactions and Air Quality Management publication trend

The graph below shows the total number of articles in aerosol-atmosphere interactions and air quality management across all publications each year (not limited to Nature Index journals).

Technical terms

Planetary boundary layer (PBL): The lowest part of the atmosphere directly influenced by the surface on timescales of an hour or less.

Aerosol optical depth (AOD): A dimensionless measure of the columnar extinction of solar radiation by aerosol scattering and absorption.

Single-scattering albedo (SSA): The ratio of scattering to total extinction (scattering plus absorption) by aerosol particles.

Black carbon (BC): Light-absorbing carbonaceous particulate from incomplete combustion of fossil fuels and biomass.

Turbulent mixing: The vertical transport of momentum, heat and mass due to eddies within the atmospheric boundary layer.

References

1. The turbulent future brings a breath of fresh air. Nature Communications (2023).
2. Black-carbon-induced regime transition of boundary layer development strongly amplifies severe haze. One Earth (2023).
3. Enhanced air pollution via aerosol-boundary layer feedback in China. Scientific Reports (2016).
4. Atmospheric aerosol size distribution impacts radiative effects over the Himalayas via modulating aerosol single-scattering albedo. npj Climate and Atmospheric Science (2023).
5. Aerosol and boundary-layer interactions and impact on air quality. National Science Review (2017).