EEA standard re-use policy: unless otherwise indicated, re-use of content on the EEA website for commercial or non-commercial purposes is permitted free of charge, provided that the source is acknowledged (http://www.eea.europa.eu/legal/copyright).
A negative value (e.g. -51%) indicates that this sector has contributed to the total reduction in emissions of ozone precursors (by 51%). In contrast, a positive value indicates an increase in emissions has occurred and hence a positive contribution to emissions has been made. NOx data are not available for Liechtenstein.