Monitoring atmospheric composition & climate
Monitoring and Forecasting of Global Atmospheric Composition

MACC monitors the composition of the atmosphere in near-real-time by assimilating observations of various meteorlogical variables as well as reactive gases and aerosols into its data assimilation system. The observations are thus used to constrain a computer model that describs the state of the atmosphere at any one moment.

Latest Forecasts

forecast forecast
Ozone and Carbon Monoxide

Clicking on the image will lead to all current global near-real-time forecasts.

Data Archive

Analysis and forecast data archive

Validation Reports

The near-real-time system is being validated on a 3-monthly basis. The latest validation report is:


The quality of the global near-real-time monitoring and forecasting services is routinely monitored. Various independent observations are used to detect problems early on and also to provide a first indication of the accuracy of the products to the users. The MACC global verification page provides access to the various verification and monitoring plots.


A brief description of the near-real-time production system can be found in the MACC Product Portfolio.

Contact details

For more details about the MACC near-real-time monitoring and forecasting service, please contact the MACC team.