5th EU Clean Air forum: fostering dialogue between science and policy for better air quality for all

As the European Centre for Medium-Range Weather Forecasting (ECMWF) gets ready to host the 5th EU Clean Air Forum in Bonn (1-2 December 2025) scientists are assessing how far we have come in efforts to reduce exposure to air pollution which remains one of the main environmental factors causing harm to human health.

Annual mean surface concentrations forNO2 and PM2.5, comparison between 2014 and 2024. Data source: CAMS European air quality reanalyses. Credit: Copernicus Atmosphere Monitoring Service / ECMWF

NO2 Interactive Version|PM 2.5 Interactive Version

Find more data insights and animations on air quality trends in Europe in ourlatest article.