Habitat: Dwarf Shrub Heath
Grid Reference: IJ327252
Grid Easting: 142500 to the 1km mid point (metres)
Grid Northing: 482500 to the 1km mid point (metres)
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Pollutant: Ammonia
Critical Level:
1.0 - 3 µg m-3
Concentration: 1.31 µg m-3
Data Year: 2018 - 2020
Exceedance: [0.31] to [-1.69] µg m-3
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Pollutant: N Deposition
Critical Load Range:
Dry heaths: 10 - 20 Kg N/ha/year
Northern wet heath: Calluna-dominated wet heath (upland moorland): 10 - 20 Kg N/ha/year
Northern wet heath: Erica tetralix dominated wet heath: 10 - 20 Kg N/ha/year
For applying the best indicative critical load values for use in impact assessments please visit the following page.
Deposition: 27.42 Kg N/ha/year
Data Year: 2018 - 2020
Exceedance Ranges:
Dry heaths [17.42] to [7.42] Kg N/ha/year
Northern wet heath: Calluna-dominated wet heath (upland moorland) [17.42] to [7.42] Kg N/ha/year
Northern wet heath: Erica tetralix dominated wet heath [17.42] to [7.42] Kg N/ha/year
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Pollutant: Nitrogen Oxides
Critical Level: 30 µg NOx (as NO2) m-3
Concentration: 4.47 µg NOx (as NO2) m-3
Data Year: 2018 - 2020
Exceedance: -25.53 µg NOx (as NO2) m-3
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Pollutant: Ozone
Critical Level: 5000 ppb hours (based on(Semi-)natural vegetation communities dominated by perennials, 6 month growing season mid April- mid October)
Exposure: 628.76 ppb hours
Data Year: 2007 - 2012
Exceedance: -4371.24 ppb hours
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Pollutant: Sulphur Dioxide
Critical Level: 20 µg m-3
Concentration: 0.48 µg m-3
Data Year: 2018 - 2020
Exceedance: -19.52 µg m-3
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Pollutant: Acid Deposition
Critical Load Class & Values:
Class: Dwarf shrub heath
CLmaxS: 0.5 CLminN: 0.643 CLmaxN: 1.143 (keq/ha/yr)
Deposition: 1.96 (N: 1.96 | S: 0.2) (keq/ha/yr)
Data Year: 2018 - 2020
Exceedance: