Annual index

The map below was made using the ATMO-Street model and is based on the annual mean concentrations of NO₂, PM₁₀ and PM_2.5.

The annual index aggregates the annual average concentration maps for NO₂, PM₁₀ and PM_2.5 into a single map with a score from 1 to 10. The concentration scales for these three pollutants are based on the WHO annual guideline values for these substances; see this information page. The annual index provides an indication of the chronic or long-term impact of air pollution on health. The higher the score, the greater the risk of adverse long-term health effects.

The calculated indices are representative for an area of a few dozen square meter. Locally, the indices may be higher or lower. Furthermore, the uncertainty of the modeled concentrations should be taken into account.
For more information about the ATMO-Street model, including the restrictions, click here.

• Annual index

Warning: the source data (i.a. emissions) and the model itself are adapted and improved every year. Only maps made with the same versions can be compared.
The following versions of the model are used:

• 2017–2019: ATMO-Street v6.2
• 2020: ATMO-Street v6.3 (Mobility assumptions were made with respect to the Covid measures.)
• 2021: ATMO-Street v6.4; new mobility input in Flanders and Brussels (FLOMOVIA v1.0)

The infrastructure and computer services used for the calculation of the model was made available by the VSC (Vlaams Supercomputer Centrum) funded by the FWO and the Flemish Government - EWI Department.