Section: Software and Platforms

Urban air quality analysis

Participants : Anne Tilloy, Vivien Mallet, Raphaël Périllat.

“Urban Air Quality Analysis” carries out data assimilation at urban scale. It merges the outputs of a numerical model (maps of pollutant concentrations) with observations from an air quality monitoring network, in order to produce the so-called analyses, that is, corrected concentration maps. The data assimilation computes the Best Linear Unbiased Estimator (BLUE), with a call to the data assimilation library Verdandi. The error covariance matrices are parameterized for both model simulations and observations. For the model state error covariances, the parameterization primarily relies on the road network. The software handles ADMS Urban output files, for a posteriori analyses or in an operational context.

In 2013, the software introduced new models for error covariances. It may now take into account tunnels. New options were added to filter out certain observations. The software was extended to handle new file formats.