ICP Forests Documentation
Source: environment.data.gov.uk (2026-01-05)

ICP Forests Level II UK data - Air Quality. Data for air quality variables measured every four weeks in 2022 and 2023 at seven 0.25 hectare ICP Forests Level II plots, including Ozone, NH3 and NO2, measured by passive diffusion tubes.

The seven sites are: 

Thetford Forest (715), Kielder Forest (919), Llyn Brianne (922), Rogate (718), Alice Holt Forest (512), Stansted Park (522) and Bradridge Wood (520).   The 'ICP Forests Level II UK data - Air Quality' is a project funded by the UK Government through Defra’s Natural Capital and Ecosystem Assessment programme (NCEA).  Users should ensure they have read the supporting documentation before viewing or making use of the data. This includes the NCEA Analysis Ready Data Limitations Statement and dataset specific limitations/caveats outlined in the supporting documentation.  

Data for the whole European database can be requested by submitting a data request form to ICP Forests here: https://www.icp-forests.net/data-maps/data-requests.  File structures are explained here: https://icp-forests.org/documentation/Surveys/AQ/index.html Attribution statement: © Forestry Commission copyright and/or database right 2025. All rights reserved.

- How to read (../Introduction/How_to_read.html)
- Submitting data (../Introduction/Submitting_data.html)
- Submitting National crown report (../Introduction/Submitting_National_crown_report.html)
- Download (../Introduction/Download.html)
- Submissions (../Overview_lists/Submissions.html)
- Experts (../Overview_lists/Experts.html)
- Projects (../Overview_lists/Projects.html)
- Publications (../Overview_lists/Publications.html)
- Free files (../Overview_lists/Free_files.html)
- GPL (../Surveys/BD/GPL.html)
- DBH (../Surveys/BD/DBH.html)
- THT (../Surveys/BD/THT.html)
- DWD (../Surveys/BD/DWD.html)
- CAN (../Surveys/BD/CAN.html)
- GVG (../Surveys/BD/GVG.html)
- TRE (../Surveys/C1/TRE.html)
- TRF (../Surveys/C1/TRF.html)
- PLF (../Surveys/F1/PLF.html)
- FOT (../Surveys/F1/FOT.html)
- FOM (../Surveys/F1/FOM.html)
- LQA (../Surveys/F1/LQA.html)
- PLS (../Surveys/S1/PLS.html)
- PRF (../Surveys/S1/PRF.html)
- PFH (../Surveys/S1/PFH.html)
- SOM (../Surveys/S1/SOM.html)
- LQA (../Surveys/S1/LQA.html)
- PL1 (../Surveys/Y1/PL1.html)
- ST1 (../Surveys/Y1/ST1.html)
- EV1 (../Surveys/Y1/EV1.html)
- PAC (../Surveys/AQ/PAC.html)
- PPS (../Surveys/AQ/PPS.html)
- AQA (../Surveys/AQ/AQA.html)
- AQP (../Surveys/AQ/AQP.html)
- COL (../Surveys/AQ/COL.html)
- AQB (../Surveys/AQ/AQB.html)
- TRC (../Surveys/CC/TRC.html)
- TRD (../Surveys/CC/TRD.html)
- PLD (../Surveys/DP/PLD.html)
- DEM (../Surveys/DP/DEM.html)
- LQA (../Surveys/DP/LQA.html)
- PLF (../Surveys/FO/PLF.html)
- FOT (../Surveys/FO/FOT.html)
- FOM (../Surveys/FO/FOM.html)
- LQA (../Surveys/FO/LQA.html)
- PGB (../Surveys/GB/PGB.html)
- GBM (../Surveys/GB/GBM.html)
- GBH (../Surveys/GB/GBH.html)
- LQA (../Surveys/GB/LQA.html)
- PLI (../Surveys/GR/PLI.html)
- IPM (../Surveys/GR/IPM.html)
- INV (../Surveys/GR/INV.html)
- IRH (../Surveys/GR/IRH.html)
- IRM (../Surveys/GR/IRM.html)
- IRP (../Surveys/GR/IRP.html)
- IRA (../Surveys/GR/IRA.html)
- IEV (../Surveys/GR/IEV.html)
- PLV (../Surveys/GV/PLV.html)
- VEM (../Surveys/GV/VEM.html)
- PLA (../Surveys/LA/PLA.html)
- LAM (../Surveys/LA/LAM.html)
- LAP (../Surveys/LA/LAP.html)
- LLF (../Surveys/LA/LLF.html)
- LFP (../Surveys/LF/LFP.html)
- LFD (../Surveys/LF/LFD.html)
- LFC (../Surveys/LF/LFC.html)
- LFA (../Surveys/LF/LFA.html)
- LQA (../Surveys/LF/LQA.html)
- LIP (../Surveys/LI/LIP.html)
- LIT (../Surveys/LI/LIT.html)
- LIS (../Surveys/LI/LIS.html)
- LIA (../Surveys/LI/LIA.html)
- PLM (../Surveys/MM/PLM.html)
- MEM (../Surveys/MM/MEM.html)
- MEH (../Surveys/MM/MEH.html)
- PLL (../Surveys/OZ/PLL.html)
- LTF (../Surveys/OZ/LTF.html)
- LSS (../Surveys/OZ/LSS.html)
- OTS (../Surveys/OZ/OTS.html)
- OZP (../Surveys/OZ/OZP.html)
- PHE (../Surveys/PH/PHE.html)
- PLP (../Surveys/PH/PLP.html)
- PHI (../Surveys/PH/PHI.html)
- PHD (../Surveys/PH/PHD.html)
- PHC (../Surveys/PH/PHC.html)
- PLT (../Surveys/SI/PLT.html)
- STA (../Surveys/SI/STA.html)
- TCO (../Surveys/SI/TCO.html)
- EVE (../Surveys/SI/EVE.html)
- PLS (../Surveys/SO/PLS.html)
- PRF (../Surveys/SO/PRF.html)
- PFH (../Surveys/SO/PFH.html)
- SOM (../Surveys/SO/SOM.html)
- LQA (../Surveys/SO/LQA.html)
- PSS (../Surveys/SS/PSS.html)
- SSM (../Surveys/SS/SSM.html)
- LQA (../Surveys/SS/LQA.html)
- SWC (../Surveys/SW/SWC.html)
- SWA (../Surveys/SW/SWA.html)
- 4 (../Explanatory_Items/4.html)
- 5 (../Explanatory_Items/5.html)
- 6 (../Explanatory_Items/6.html)
- 11 (../Explanatory_Items/11.html)
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- 28 (../Explanatory_Items/28.html)
- 39 (../Explanatory_Items/39.html)
- 41 (../Explanatory_Items/41.html)
- 43 (../Explanatory_Items/43.html)
- 45 (../Explanatory_Items/45.html)
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- 120 (../Explanatory_Items/120.html)
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- 130 (../Explanatory_Items/130.html)
- 131 (../Explanatory_Items/131.html)
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- 140 (../Explanatory_Items/140.html)
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- 150 (../Explanatory_Items/150.html)
- 151 (../Explanatory_Items/151.html)
- 153 (../Explanatory_Items/153.html)
- 154 (../Explanatory_Items/154.html)
- 155 (../Explanatory_Items/155.html)
- 158 (../Explanatory_Items/158.html)
- 160 (../Explanatory_Items/160.html)
- 161 (../Explanatory_Items/161.html)
- 165 (../Explanatory_Items/165.html)
- 167 (../Explanatory_Items/167.html)
- 168 (../Explanatory_Items/168.html)
- 170 (../Explanatory_Items/170.html)
- 171 (../Explanatory_Items/171.html)
- 173 (../Explanatory_Items/173.html)
- 174 (../Explanatory_Items/174.html)
- 175 (../Explanatory_Items/175.html)
- 176 (../Explanatory_Items/176.html)
- 177 (../Explanatory_Items/177.html)
- 178 (../Explanatory_Items/178.html)
- 182 (../Explanatory_Items/182.html)
- 183 (../Explanatory_Items/183.html)
- 190 (../Explanatory_Items/190.html)
- 191 (../Explanatory_Items/191.html)
- 193 (../Explanatory_Items/193.html)
- 194 (../Explanatory_Items/194.html)
- 195 (../Explanatory_Items/195.html)
- 197 (../Explanatory_Items/197.html)
- 200 (../Explanatory_Items/200.html)
- 201 (../Explanatory_Items/201.html)
- 206 (../Explanatory_Items/206.html)
- 210 (../Explanatory_Items/210.html)
- 211 (../Explanatory_Items/211.html)
- 212 (../Explanatory_Items/212.html)
- 213 (../Explanatory_Items/213.html)
- 220 (../Explanatory_Items/220.html)
- 301 (../Explanatory_Items/301.html)
- 302 (../Explanatory_Items/302.html)
- 303 (../Explanatory_Items/303.html)
- 304 (../Explanatory_Items/304.html)
- 305 (../Explanatory_Items/305.html)
- 306 (../Explanatory_Items/306.html)
- 307 (../Explanatory_Items/307.html)
- 308 (../Explanatory_Items/308.html)
- 309 (../Explanatory_Items/309.html)
- 310 (../Explanatory_Items/310.html)
- 311 (../Explanatory_Items/311.html)
- 400 (../Explanatory_Items/400.html)
- d accuracy (../Dictionaries/d_accuracy.html)
- d affectpart (../Dictionaries/d_affectpart.html)
- d age determination (../Dictionaries/d_age_determination.html)
- d altitude (../Dictionaries/d_altitude.html)
- d apical shoot (../Dictionaries/d_apical_shoot.html)
- d bark type (../Dictionaries/d_bark_type.html)
- d canopy (../Dictionaries/d_canopy.html)
- d canopy gaps (../Dictionaries/d_canopy_gaps.html)
- d cause (../Dictionaries/d_cause.html)
- d cause sc name (../Dictionaries/d_cause_sc_name.html)
- d cdrd n (../Dictionaries/d_cdrd_n.html)
- d certainty (../Dictionaries/d_certainty.html)
- d clumping method (../Dictionaries/d_clumping_method.html)
- d compound aq (../Dictionaries/d_compound_aq.html)
- d country (../Dictionaries/d_country.html)
- d crown assess (../Dictionaries/d_crown_assess.html)
- d crown form (../Dictionaries/d_crown_form.html)
- d damage age (../Dictionaries/d_damage_age.html)
- d decay (../Dictionaries/d_decay.html)
- d defoliation (../Dictionaries/d_defoliation.html)
- d dendrometer (../Dictionaries/d_dendrometer.html)
- d depth level soil (../Dictionaries/d_depth_level_soil.html)
- d det top height (../Dictionaries/d_det_top_height.html)
- d determination dp ss (../Dictionaries/d_determination_dp_ss.html)
- d determination fo gb lf (../Dictionaries/d_determination_fo_gb_lf.html)
- d determination la (../Dictionaries/d_determination_la.html)
- d determination so (../Dictionaries/d_determination_so.html)
- d diameter (../Dictionaries/d_diameter.html)
- d direction (../Dictionaries/d_direction.html)
- d dw rem (../Dictionaries/d_dw_rem.html)
- d dw type (../Dictionaries/d_dw_type.html)
- d event (../Dictionaries/d_event.html)
- d event location (../Dictionaries/d_event_location.html)
- d event score (../Dictionaries/d_event_score.html)
- d event type (../Dictionaries/d_event_type.html)
- d extent (../Dictionaries/d_extent.html)
- d extraction method (../Dictionaries/d_extraction_method.html)
- d extraction tools (../Dictionaries/d_extraction_tools.html)
- d fence (../Dictionaries/d_fence.html)
- d fencing (../Dictionaries/d_fencing.html)
- d flowering (../Dictionaries/d_flowering.html)
- d foliage transparency (../Dictionaries/d_foliage_transparency.html)
- d forest owner (../Dictionaries/d_forest_owner.html)
- d forest type (../Dictionaries/d_forest_type.html)
- d forest type bd (../Dictionaries/d_forest_type_bd.html)
- d fruiting (../Dictionaries/d_fruiting.html)
- d functional group (../Dictionaries/d_functional_group.html)
- d gr inv type (../Dictionaries/d_gr_inv_type.html)
- d gr plot design (../Dictionaries/d_gr_plot_design.html)
- d gr quality code (../Dictionaries/d_gr_quality_code.html)
- d ground water table (../Dictionaries/d_ground_water_table.html)
- d hor master prefix (../Dictionaries/d_hor_master_prefix.html)
- d hori disc (../Dictionaries/d_hori_disc.html)
- d hori distinct (../Dictionaries/d_hori_distinct.html)
- d hori topography (../Dictionaries/d_hori_topography.html)
- d humus (../Dictionaries/d_humus.html)
- d layer (../Dictionaries/d_layer.html)
- d layer surface (../Dictionaries/d_layer_surface.html)
- d leaves type (../Dictionaries/d_leaves_type.html)
- d litter sample (../Dictionaries/d_litter_sample.html)
- d location (../Dictionaries/d_location.html)
- d loccrown (../Dictionaries/d_loccrown.html)
- d logging method (../Dictionaries/d_logging_method.html)
- d manage intensity (../Dictionaries/d_manage_intensity.html)
- d manage type (../Dictionaries/d_manage_type.html)
- d manage type bd (../Dictionaries/d_manage_type_bd.html)
- d mean age (../Dictionaries/d_mean_age.html)
- d mean age bd (../Dictionaries/d_mean_age_bd.html)
- d measurement average (../Dictionaries/d_measurement_average.html)
- d method ph (../Dictionaries/d_method_ph.html)
- d nfi status (../Dictionaries/d_nfi_status.html)
- d notimb util (../Dictionaries/d_notimb_util.html)
- d nursery system (../Dictionaries/d_nursery_system.html)
- d orientation (../Dictionaries/d_orientation.html)
- d origin meteo (../Dictionaries/d_origin_meteo.html)
- d parameter dp (../Dictionaries/d_parameter_dp.html)
- d parameter fogv (../Dictionaries/d_parameter_fogv.html)
- d parameter lf (../Dictionaries/d_parameter_lf.html)
- d parameter so (../Dictionaries/d_parameter_so.html)
- d parameter ss (../Dictionaries/d_parameter_ss.html)
- d parent material (../Dictionaries/d_parent_material.html)
- d partner (../Dictionaries/d_partner.html)
- d perennial (../Dictionaries/d_perennial.html)
- d plot design (../Dictionaries/d_plot_design.html)
- d plot status (../Dictionaries/d_plot_status.html)
- d precision oz (../Dictionaries/d_precision_oz.html)
- d preparation type (../Dictionaries/d_preparation_type.html)
- d pretreatment fo gb lf (../Dictionaries/d_pretreatment_fo_gb_lf.html)
- d pretreatment so (../Dictionaries/d_pretreatment_so.html)
- d preuse bd (../Dictionaries/d_preuse_bd.html)
- d prev landuse (../Dictionaries/d_prev_landuse.html)
- d recording (../Dictionaries/d_recording.html)
- d ref tree (../Dictionaries/d_ref_tree.html)
- d removal mortality ccgr (../Dictionaries/d_removal_mortality_ccgr.html)
- d root abundance (../Dictionaries/d_root_abundance.html)
- d sample prep dp ss (../Dictionaries/d_sample_prep_dp_ss.html)
- d sample prep so (../Dictionaries/d_sample_prep_so.html)
- d sampler deposition (../Dictionaries/d_sampler_deposition.html)
- d sampler deposition harmon (../Dictionaries/d_sampler_deposition_harmon.html)
- d sampler passive (../Dictionaries/d_sampler_passive.html)
- d sampler ss (../Dictionaries/d_sampler_ss.html)
- d sampling deposition (../Dictionaries/d_sampling_deposition.html)
- d shading (../Dictionaries/d_shading.html)
- d shoot epicormic (../Dictionaries/d_shoot_epicormic.html)
- d silvicult system (../Dictionaries/d_silvicult_system.html)
- d sky condition (../Dictionaries/d_sky_condition.html)
- d slash disposal (../Dictionaries/d_slash_disposal.html)
- d social class (../Dictionaries/d_social_class.html)
- d software (../Dictionaries/d_software.html)
- d soil adjective (../Dictionaries/d_soil_adjective.html)
- d soil coarse fragments (../Dictionaries/d_soil_coarse_fragments.html)
- d soil code porosity (../Dictionaries/d_soil_code_porosity.html)
- d soil compaction (../Dictionaries/d_soil_compaction.html)
- d soil group (../Dictionaries/d_soil_group.html)
- d soil moisture (../Dictionaries/d_soil_moisture.html)
- d soil specifier (../Dictionaries/d_soil_specifier.html)
- d soil structure (../Dictionaries/d_soil_structure.html)
- d spec symptom (../Dictionaries/d_spec_symptom.html)
- d stand actual (../Dictionaries/d_stand_actual.html)
- d stand history (../Dictionaries/d_stand_history.html)
- d status data (../Dictionaries/d_status_data.html)
- d status mcpfe class1 (../Dictionaries/d_status_mcpfe_class1.html)
- d status mcpfe class2 (../Dictionaries/d_status_mcpfe_class2.html)
- d status mcpfe class3 (../Dictionaries/d_status_mcpfe_class3.html)
- d stock type (../Dictionaries/d_stock_type.html)
- d substrate (../Dictionaries/d_substrate.html)
- d sun position (../Dictionaries/d_sun_position.html)
- d survey oz (../Dictionaries/d_survey_oz.html)
- d survey type gv (../Dictionaries/d_survey_type_gv.html)
- d symp leaves (../Dictionaries/d_symp_leaves.html)
- d symptom (../Dictionaries/d_symptom.html)
- d texture class (../Dictionaries/d_texture_class.html)
- d tools (../Dictionaries/d_tools.html)
- d treatment aim (../Dictionaries/d_treatment_aim.html)
- d tree age (../Dictionaries/d_tree_age.html)
- d tree damage status (../Dictionaries/d_tree_damage_status.html)
- d tree layer bd (../Dictionaries/d_tree_layer_bd.html)
- d tree layers (../Dictionaries/d_tree_layers.html)
- d tree spec (../Dictionaries/d_tree_spec.html)
- d tree spec dw (../Dictionaries/d_tree_spec_dw.html)
- d tree spec fo (../Dictionaries/d_tree_spec_fo.html)
- d tree species mix (../Dictionaries/d_tree_species_mix.html)
- d tree status (../Dictionaries/d_tree_status.html)
- d treemix (../Dictionaries/d_treemix.html)
- d type validation (../Dictionaries/d_type_validation.html)
- d validated (../Dictionaries/d_validated.html)
- d variable (../Dictionaries/d_variable.html)
- d vertical from (../Dictionaries/d_vertical_from.html)
- d visibility (../Dictionaries/d_visibility.html)
- d visible crown (../Dictionaries/d_visible_crown.html)
- d volume (../Dictionaries/d_volume.html)
- d water (../Dictionaries/d_water.html)
- d water table type (../Dictionaries/d_water_table_type.html)
- d wrb diagnostics (../Dictionaries/d_wrb_diagnostics.html)
- d wrb pub (../Dictionaries/d_wrb_pub.html)
- BD (../Tests/BD.html)
- C1 (../Tests/C1.html)
- F1 (../Tests/F1.html)
- S1 (../Tests/S1.html)
- Y1 (../Tests/Y1.html)
- AQ (../Tests/AQ.html)
- CC (../Tests/CC.html)
- DP (../Tests/DP.html)
- FO (../Tests/FO.html)
- GB (../Tests/GB.html)
- GR (../Tests/GR.html)
- GV (../Tests/GV.html)
- LA (../Tests/LA.html)
- LF (../Tests/LF.html)
- LI (../Tests/LI.html)
- MM (../Tests/MM.html)
- OZ (../Tests/OZ.html)
- PH (../Tests/PH.html)
- SI (../Tests/SI.html)
- SO (../Tests/SO.html)
- SS (../Tests/SS.html)
- SW (../Tests/SW.html)
- TV (../Tests/TV.html)
- BD (../Change_History/Change_of_forms/BD.html)
- C1 (../Change_History/Change_of_forms/C1.html)
- F1 (../Change_History/Change_of_forms/F1.html)
- S1 (../Change_History/Change_of_forms/S1.html)
- Y1 (../Change_History/Change_of_forms/Y1.html)
- AQ (../Change_History/Change_of_forms/AQ.html)
- CC (../Change_History/Change_of_forms/CC.html)
- DP (../Change_History/Change_of_forms/DP.html)
- FO (../Change_History/Change_of_forms/FO.html)
- GB (../Change_History/Change_of_forms/GB.html)
- GR (../Change_History/Change_of_forms/GR.html)
- GV (../Change_History/Change_of_forms/GV.html)
- LA (../Change_History/Change_of_forms/LA.html)
- LF (../Change_History/Change_of_forms/LF.html)
- LI (../Change_History/Change_of_forms/LI.html)
- MM (../Change_History/Change_of_forms/MM.html)
- OZ (../Change_History/Change_of_forms/OZ.html)
- PH (../Change_History/Change_of_forms/PH.html)
- SI (../Change_History/Change_of_forms/SI.html)
- SO (../Change_History/Change_of_forms/SO.html)
- SS (../Change_History/Change_of_forms/SS.html)
- SW (../Change_History/Change_of_forms/SW.html)
- TV (../Change_History/Change_of_forms/TV.html)
- Change of dictionaries (../Change_History/Change_of_dictionaries/index.html)
- LQA Codes (../Annex/LQA/LQA_Codes.html)
- Ring test participation (../Annex/LQA/Ring_test_participation.html)
- Beech (../Annex/Phenological_phases/Beech.html)
- Black alder (../Annex/Phenological_phases/Black_alder.html)
- British oak (../Annex/Phenological_phases/British_oak.html)
- European larch (../Annex/Phenological_phases/European_larch.html)
- Evergreen oak (../Annex/Phenological_phases/Evergreen_oak.html)
- Limetree (../Annex/Phenological_phases/Limetree.html)
- Norway spruce (../Annex/Phenological_phases/Norway_spruce.html)
- Rowan (../Annex/Phenological_phases/Rowan.html)
- Scots pine (../Annex/Phenological_phases/Scots_pine.html)
- Silver birch (../Annex/Phenological_phases/Silver_birch.html)
Dataportal (https://icp-forests.org/data) Community (http://icp-forests.net)

Introduction (../Introduction/index.html)

Welcome to ICP Forests - Online Documentation

The Online Documentation is a comprehensive set of metadata describing the ICP Forests database.

Main part is the data description of all surveys (../Surveys/index.html), each subdivided into forms (synonymous with tables)

Use the ‘Search’ at the top of the left navigation menu to quickly find relevant sites for your topic of interest.

For the overall work with ICP Forests Data you might need one of the following links:

DATA PORTAL / SUBMISSION:

DATA DOCUMENTATION:

OVERVIEW LISTS:
- Previous (../index.html)
- Next (../Introduction/How_to_read.html)