Site Relevant Critical Loads and Source Attribution

!News of updates!

The pollution concentration and deposition data in the Site Relevant Critical Load Tool have been updated and are now based on a 3-year mean for 2013-15.

The source attribution data has also been updated. This provides a breakdown of the sources contributing to acid and nitrogen deposition at each site. It is based on 2012 emissions data.

About the Site Relevant Critical Loads Tool

The ‘Site Relevant Critical Loads’ tool provides critical loads for acidity and nitrogen for designated features within every SAC, SPA or A/SSSI in the UK. You can view an overview of each interest feature for each site. Critical loads are assigned to each sensitive feature for either nutrient nitrogen or acidity. Furthermore, deposition data for nitrogen and sulphur at each site are provided, apportioned to major sources, and presented in pie charts. You can also select a grid reference if you know the exact location of your feature within a site. Simply follow the screen below.

Search by SiteSelect a designation type and select 'Next'


Devon SAC
East Devon Pebblebed Heaths SAC
[photo: Clinton Devon Estates]