The directives require Member States to ensure that up-to-date information on ambient concentrations of the different pollutants is routinely made available to the public as well as to other organisations. This is done by providing information on websites, teletext, in press and also by public displays. The information needs to be updated as appropriate to the averaging periods. The relation to the different limit and target values needs to be clear. When information or alert thresholds are exceeded Member States need to inform the public about the exceedance and the actions that are eventually taken. This obligation is prescribed in detail in the different directives.
On the Community level a number of sources exist that provide information to the public. Several important databases concerning air quality are managed by the European Environment Agency (EEA).