Environmental data is that which is based on the measurement of environmental pressures, the state of the environment and the impacts on ecosystems. This is usually the "P", "S" and "I" of the DPSIR model where D = Drivers, P = Pressures, S = State, I = Impact, R = Response.
Environmental data is typically generated by institutions executing environmental law or doing environmental research. Environment statistics are usually generated by statistical offices and are considered as environmental data, too. Socio-economic data and other statistical data (often the "D" and the "R" of the DPSIR model) are not considered as environmental data. However, they are to be integrated into comprehensive environmental assessments. Usually this kind of data is hold by other institutions than the environmental administration (e.g. National Statistical Offices). The same is true for geo-basisdata, which are not considered as environmental data, but have to be available for environmental policies and environmental information.
All data generated by the execution of environmental law are to be considered as environmental data.