The Impact Risk Zones (IRZs) are a GIS tool developed by Natural England to make rapid initial assessment of the potential risks posed by development proposals to: Sites of Special Scientific Interest (SSSIs), Special Areas of Conservation (SACs), Special Protection Areas (SPAs) and Ramsar sites. They define zones around each site which reflect the particular sensitivities of the features for which it is notified and indicate the types of development proposal which could potentially have adverse impacts. The IRZs can be used by local planning authorities (LPAs) to consider whether a proposed development is likely to affect a SSSI, SAC, SPA or Ramsar site and determine whether they will need to consult Natural England to seek advice on the nature of any potential impacts and how they might be avoided or mitigated. Download the IRZs for use on your own GIS from the dropdown menu above or the links below. Download the latest update (September 2023) in Mapinfo TAB format. Download the latest update (September 2023) in ESRI Shapefile format. Use the IRZs online on the MAGIC website. View guidance on the interpretation and use of the IRZs. View information on when LPAs must consult Natural England on planning and development proposals on GOV.UK. View information on how developers can get advice from Natural England on planning applications on GOV.UK.Full metadata can be viewed on data.gov.uk.