Near real time benzene concentration measurements transmitted to EEA by national and regional air quality networks (http://www.eea.europa.eu/themes/air/air-quality/resources/who-provides-the-air-quality-data). The measurements are preliminary and may be changed at any time by the data providers following their quality control procedures. The measurements may not be used for compliance purposes.

Near real time concentration of PM2.5 measurements transmitted to EEA by national and regional air quality networks (http://www.eea.europa.eu/themes/air/air-quality/resources/who-provides-the-air-quality-data). The measurements are preliminary and may be changed at any time by the data providers following their quality control procedures. The measurements may not be used for compliance purposes.

Near real time nitrogen oxides (NOx) concentration measurements transmitted to EEA by national and regional air quality networks (http://www.eea.europa.eu/themes/air/air-quality/resources/who-provides-the-air-quality-data). The measurements are preliminary and may be changed at any time by the data providers following their quality control procedures. The measurements may not be used for compliance purposes.

Near real time carbon monoxide (CO) concentration measurements transmitted to EEA by national and regional air quality networks (http://www.eea.europa.eu/themes/air/air-quality/resources/who-provides-the-air-quality-data). The measurements are preliminary and may be changed at any time by the data providers following their quality control procedures. The measurements may not be used for compliance purposes.

Near real time sulphur dioxide (SO2) concentration measurements transmitted to EEA by national and regional air quality networks (http://www.eea.europa.eu/themes/air/air-quality/resources/who-provides-the-air-quality-data). The measurements are preliminary and may be changed at any time by the data providers following their quality control procedures. The measurements may not be used for compliance purposes.

Near real time nitrogen dioxide (NO2) concentration measurements transmitted to EEA by national and regional air quality networks (http://www.eea.europa.eu/themes/air/air-quality/resources/who-provides-the-air-quality-data). The measurements are preliminary and may be changed at any time by the data providers following their quality control procedures. The measurements may not be used for compliance purposes.

Near real time ozone concentration measurements transmitted to EEA by national and regional air quality networks (http://www.eea.europa.eu/themes/air/air-quality/resources/who-provides-the-air-quality-data). The measurements are preliminary and may be changed at any time by the data providers following their quality control procedures. The measurements may not be used for compliance purposes.

Near real time concentration of PM10 measurements transmitted to EEA by national and regional air quality networks (http://www.eea.europa.eu/themes/air/air-quality/resources/who-provides-the-air-quality-data). The measurements are preliminary and may be changed at any time by the data providers following their quality control procedures. The measurements may not be used for compliance purposes.

Near real time concentration of pollutants in ambient air, measured at ground-level by monitoring stations in Europe and transmitted to EEA by national and regional air quality networks (http://www.eea.europa.eu/themes/air/air-quality/resources/who-provides-the-air-quality-data). All pollutants might not be monitored at all stations. The measurements are preliminary and may be changed at any time by the data providers following their quality control procedures. The measurements may not be used for compliance purposes.

AirBase is the European air quality database maintained by the EEA through its European topic centre on Air pollution and Climate Change mitigation. It contains air quality monitoring data and information submitted by participating countries throughout Europe. The air quality database consists of a multi-annual time series of air quality measurement data and statistics for a number of air pollutants. It also contains meta-information on those monitoring networks involved, their stations and their measurements. The database covers geographically all EU Member States, the EEA member countries and some EEA collaborating countries. The EU Member States are bound under Decision 97/101/EC to engage in a reciprocal exchange of information (EoI) on ambient air quality. The EEA engages with its member and collaborating countries to collect the information foreseen by the EoI Decision because air pollution is a pan European issue and the EEA is the European body which produces assessments of air quality, covering the whole geographical area of Europe. All pollutants might not be monitored at all stations.