“Real time” data for measuring regulated air pollutant concentrations

The monitoring of ambient air quality in France is entrusted to the 18 Associations Agréées de Surveillance de la Qualité de l’Air (AASQA). The air quality monitoring stations involved in this monitoring are operated and managed by the AASQA. The measured data from these stations are transmitted over the water to the Central Air Quality Monitoring Laboratory (LCSQA) for integration into the national air quality database called GEOD’AIR. The LCSQA is mandated by the Ministry responsible for the Environment to carry out the regulatory reporting of air quality in accordance with the terms of the European Directives and Decisions. The data available through these processes are hourly data from automatic analysers. The concentrations of the following air pollutants shall be measured: — Ozone (O3) — Nitrogen dioxide (NO2) — Sulphur dioxide (SO2) — Particles with a diameter of less than 10 µm (PM10) — Particles with a diameter of less than 2,5 µm (PM2.5) — Carbon monoxide (CO) All the observations measured for these pollutants participating in the national regulatory oversight system shall be made available. These data are transmitted to the European Environment Agency (EPA) according to a formalism defined and documented in reference guides (the so-called “IPR guide” and “user guide for the data model and xml”). This real-time data stream (or UTD data for “Up-To-Date”) is named by the “flux E2” convention. The files transmitted in this context are made available to the general public on this page. The “Documentation” section below provides an explanatory note on the files made available and links to the European reference guides.