THIS DATASET HAS BEEN WITHDRAWN.
A mapping error occurred in the ammonia data of CBED 2018-2020. This also translates to an error in total nitrogen deposition.
The origin of the error is an R software update problem using the library 'proj4' to project to British National Grid which did not project correctly. Further QC checks have been put in place to help prevent this type of error occurring again. As an update, CBED and APIS - 2019-2021 will be published soon (see https://www.apis.ac.uk/revised-APIS-2019 )
If you need access to this archived version, please contact the EIDC