Provision of air quality data on France (www.prevair.org)

PREV’AIR offers a selection of air quality products accessible every day at 9 a.m. (local time in mainland France). The data made available concern the **forecast** (up to D+2) and the**analysis** (optimal representation based on modelling and real-time observations available daily for the day before D-1) of the surface concentrations (in µg/m3) of the main pollutants, namely **ozone** (O3) and **particles** (PM10). The values provided relate either to the hourly maximum of the day or to the daily average. The data are available in the form of maps covering metropolitan France at a spatial resolution of approximately 2km. The latitude longitude (lat/lon) variables corresponding to the center of the meshes of the model. The files are in netcdf format, see for example [this page](https://en.wikipedia.org/wiki/NetCDF) for examples of uses. The Open Licence of the etalab mission requires that the producer of these data be identified in any reuse, which can be done for example with the mention: ‘Data from the national air quality forecasting platform [www.prevair.org](http://www.prevair.org)’. We would be grateful if you could inform us about possible uses at <prevair@ineris.fr>.&#x20; **Attention** some browsers force in **https** the connection to http\://www\.prevair.org/donneesmisadispo/public/ - We are currently working on solving this problem.