4f4c4942-4343-5764-6473-313234373632 English NRW_DS98776 Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en 2025-12-19T10:33:02.255Z NRW 1.0 wel British National Grid (EPSG::27700) SSSI NH3 Critical Levels SSSI NH3 Critical Levels dordeb Gwyddonol Arbennig (SoDdGAau) Sites of Special Scientific Interest ammonia critical levels SoDdGA NH3 Lefelau Critigol 2022-08-03 NRW_DS124762 This layer provides a Critical Level (CLe) for ammonia against which impacts on a SSSI should be assessed. The value is the lowest CLe for a feature on that site. The layer gives the SSSI name, SSSI code and ammonia Critical Level. The ammonia CLe can be: 1: a 1µg/m3 NH3 Critical Level indicates a SSSI has N-sensitive bryophytes/lichens as a feature or has bryophytes/lichens as key components of a habitat feature of that SSSI: 3: a 3µg/m3 NH3 Critical Level indicates a SSSI has N-sensitive vegetation, or has invertebrate features that are dependent on N-sensitive vegetation. NS: all features on a site are considered not to be particularly sensitive to ammonia; this does not mean that other aspects of a development will not have negative impacts on a SSSI, for example through water pollution or disturbance. This layer provides a Critical Level (CLe) for ammonia against which impacts on a SSSI should be assessed. The value is the lowest CLe for a feature on that site. The layer gives the SSSI name, SSSI code and ammonia Critical Level. The ammonia CLe can be: 1: a 1µg/m3 NH3 Critical Level indicates a SSSI has N-sensitive bryophytes/lichens as a feature or has bryophytes/lichens as key components of a habitat feature of that SSSI: 3: a 3µg/m3 NH3 Critical Level indicates a SSSI has N-sensitive vegetation, or has invertebrate features that are dependent on N-sensitive vegetation. NS: all features on a site are considered not to be particularly sensitive to ammonia; this does not mean that other aspects of a development will not have negative impacts on a SSSI, for example through water pollution or disturbance. Mae'r haen hon yn dangos y lefel gritigol (CLe) ar gyfer amonia y dylid asesu effeithiau ar SoDdGA yn ei herbyn. Y gwerth a nodir yw'r gwerth CLe isaf ar gyfer nodwedd ar y safle hwnnw. Mae'r haen yn cynnwys enw'r SoDdGA, cod y SoDdGA a'r lefel gritigol ar gyfer amonia. Gall y CLe ar gyfer amonia fod yn: 1: mae lefel gritigol NH3 o 1µg/m3 yn dangos bod bryoffytau/cennau sy'n sensitif i nitrogen yn nodweddiadol o'r SoDdGA, neu fod bryoffytau/cennau'n gydrannau allweddol o nodwedd cynefin y SoDdGA hwnnw; 3: mae lefel gritigol NH3 o 3µg/m3 yn dangos bod gan SoDdGA lystyfiant sy'n sensitif i nitrogen, neu nodweddion infertebrat y maent yn ddibynnol ar lystyfiant sy'n sensitif i nitrogen; NS: ystyrir bod yr holl nodweddion ar safle heb fod yn enwedig o sensitif i amonia; nid yw hyn yn golygu na fydd agweddau eraill ar ddatblygiad yn cael effaith negyddol ar SoDdGA, er enghraifft drwy lygredd dŵr neu darfu. Cydnabyddiaeth Yn cynnwys gwybodaeth Cyfoeth Naturiol Cymru © Cyfoeth Naturiol Cymru a Hawl Cronfa Ddata. Cedwir pob hawl. Yn cynnwys data Arolwg Ordnans. Rhif Trwydded Arolwg Ordnans AC0000849444. Hawlfraint y Goron a Hawl Cronfa Ddata. Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Protected sites GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme ammonia NRW Thesaurus 2025-01-08 geonetwork.thesaurus.local.theme.converted_nrw-keywords SeaDataNet Parameter Discovery Vocabulary 2024-06-19 geonetwork.thesaurus.external.theme.rdf+xml IPSV Subjects List 2020-11-18 geonetwork.thesaurus.external.theme.subjects NRW SMNR Keywords 2024-06-26 geonetwork.thesaurus.local.theme.converted_nrw-smnr-keywords There are no access restrictions on this data. NRW may release, publish or disseminate it freely. no limitations © CNC/NRW All rights Reserved. Contains Ordnance Survey Data. Ordnance Survey Licence number AC0000849444. Crown Copyright and Database Right Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and copyright of the owners. It is the recipient's responsibility to ensure the data is fit for the intended purpose. Attribution Statement: Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. Contains Ordnance Survey Data. Ordnance Survey Licence number AC0000849444. Crown Copyright and Database Right. Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. Contains Ordnance Survey Data. Ordnance Survey Licence number AC0000849444. Crown Copyright and Database Right. Open Government Licence English environment SeaVoX Vertical Co-ordinate Coverages 2021-01-06 Wales (WLS) -5.777741 -2.608865 51.240829 53.513067 2000-01-01 2021-07-30 Sites of Special Scientific Interest (SSSIs) Geographic Information System Unknown ESRI Feature Class https://datamap.gov.wales/layers/geonode:nrw_sssi_nh3_cl WWW:LINK-1.0-http--link View & Download Data https://datamap.gov.wales/capabilities/layer/3583/?ows_service=wms OGC:WMS Web Mapping Service Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 This dataset has not been assessed for conformance to the referenced INSPIRE regulation. false The dataset is based on the SSSI GIS Dataset (metadata number NRW_DS98776) with Critical Levels determined by the Terrestrial Ecosystems and Species Team. The dataset is based on the SSSI GIS Dataset (metadata number NRW_DS98776) with Critical Levels determined by the Terrestrial Ecosystems and Species Team.