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A few images from 21st International Conference on Nucleation and Atmospheric Aerosols, 2023, Brisbane, Queensland, Australia. The website for the 22nd conference (ICNAA 2025) is now live! -->

The Committee on Nucleation and Atmospheric Aerosols brings together scientists covering the following subject areas:

Nucleation Theory & Experiment: Studies of homogeneous, heterogeneous and ion induced nucleation including single or multicomponent system cluster formation and properties, condensation, and evaporation, and experimental, theoretical and computational investigations.

Tropospheric & Stratospheric Aerosols: Fundamental processes associated with tropospheric and stratospheric aerosols, especially related to global warming, acid rain, air quality and multi-phase chemistry.  Studies into aerosol concentrations and distributions, variability and long term trends. Focus on composition, hygroscopicity, thermodynamics, phase changes, physico-chemical properties, and optical properties.

Cloud Drop and Ice Nucleation: Fundamental processes related to droplet and ice-crystal activation, growth, cloud condensation nuclei and ice nuclei origin, composition, spatial and temporal distributions and loadings, experimental and theoretical studies.

Aerosol-Climate Interactions: Direct and indirect effects of atmospheric aerosols on radiative forcing and climate, remote sensing and regional to global scale climate modelling of aerosol impacts and feedback systems.

The CNAA is a committee of the International Association of Meteorology and Atmospheric Sciences (IAMAS, a constituent association of the IUGG) that is affiliated with IAMAS's International Commission on Clouds and Precipitation (ICCP). The 22nd International Conference on Nucleation & Atmospheric Aerosols (ICNAA 2025) to be held from 24-29 August 2025 in Vienna, Austria is one of a series organized by the CNAA, now at ~4 year intervals. This conference is typically held one year following the ICCP's related International Conference on Clouds and Precipitation.