Query by Location - Results

Data Update 17/05/2022: The pollution concentration and deposition data in the Site Relevant Critical Load Tool has been updated to use the 3-year mean for the years 2018-20.

Habitat: Dwarf Shrub Heath

Grid Reference: TQ456294

Grid Easting: 545500 to the 1km mid point (metres)

Grid Northing: 129500 to the 1km mid point (metres)

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Pollutant: Ammonia

Critical Level: 1.0 - 3 µg m-3

Concentration: 2.23 µg m-3

Data Year: 2018 - 2020

Exceedance: [1.23] to [-0.77] 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: 19.18 Kg N/ha/year

Data Year: 2018 - 2020

Exceedance Ranges:
Dry heaths [9.18] to [-0.82] Kg N/ha/year
Northern wet heath: Calluna-dominated wet heath (upland moorland) [9.18] to [-0.82] Kg N/ha/year
Northern wet heath: Erica tetralix dominated wet heath [9.18] to [-0.82] Kg N/ha/year

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Pollutant: Nitrogen Oxides

Critical Level: 30 µg NOx (as NO2) m-3

Concentration: 9.22 µg NOx (as NO2) m-3

Data Year: 2018 - 2020

Exceedance: -20.78 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: 1486.97 ppb hours

Data Year: 2007 - 2012

Exceedance: -3513.03 ppb hours

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Pollutant: Sulphur Dioxide

Critical Level: 20 µg m-3

Concentration: 0.67 µg m-3

Data Year: 2018 - 2020

Exceedance: -19.33 µg m-3

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Pollutant: Acid Deposition

Critical Load Class & Values:
Class: Dwarf shrub heath
CLmaxS: 0.33 CLminN: 0.642 CLmaxN: 0.972 (keq/ha/yr)

Deposition: 1.41 (N: 1.37 | S: 0.12) (keq/ha/yr)

Data Year: 2018 - 2020

Exceedance: