Technical Annual Status Report (Stage 2) for the CLRTAP Inventory Review: Synthesis and Assessment Country report
KEY CATEGORY ANALYSIS
Party: GB Submission year: 2025
Key categories analysis is becoming important in prioritising emission sources and identifying where inventory improvements can be most efficiently implemented. We have assessed the most important sources (the sources making up 80% of the national total) for your country, based on your latest submission. The key sources for the 2023, 2010 and 2005 emissions, including the corresponding percentages, are listed below. |
| Component | Year | Key categories (Sorted from high to low from left to right) | Total | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NOx | 2023 | 1A3bi (17.9%) | 1A3dii (10.8%) | 1A3bii (10.1%) | 1A1a (9.2%) | 1A2gviii (8.1%) | 1A1c (7.1%) | 1A4ai (6.7%) | 1A3biii (3.9%) | 1A4bi (3.8%) | 1A5b (2.1%) | 1A1b (1.9%) | 81.5% | ||||||
| NMVOC | 2023 | 2D3a (22.4%) | 2H2 (15.9%) | 2D3d (7.0%) | 3Da2a (5.8%) | 2D3i (3.9%) | 3B1a (3.6%) | 3B1b (3.6%) | 1A4bi (3.4%) | 1A3bv (3.0%) | 1B2av (2.9%) | 1B2ai (2.9%) | 1B2b (2.7%) | 2D3g (2.2%) | 1A3bi (1.7%) | 81.1% | |||
| SOx | 2023 | 1A1b (20.0%) | 1A2gviii (18.8%) | 1A4bi (14.1%) | 1A1a (7.6%) | 1B1b (6.9%) | 1A3dii (5.7%) | 1A2a (4.8%) | 2A6 (4.7%) | 82.6% | |||||||||
| NH3 | 2023 | 3Da2a (20.9%) | 3Da1 (15.5%) | 3B1a (13.4%) | 3B1b (12.5%) | 3Da2c (7.5%) | 3Da3 (7.0%) | 6A (6.7%) | 83.4% | ||||||||||
| PM2.5 | 2023 | 1A4bi (19.2%) | 1A3bvi (12.9%) | 5C2 (9.7%) | 1A2gviii (6.3%) | 1A3bvii (5.4%) | 2A5b (4.4%) | 5E (3.1%) | 1A3dii (3.1%) | 2C1 (3.1%) | 1A4ai (2.4%) | 1A3bi (2.2%) | 2A6 (1.7%) | 2G (1.7%) | 1A1a (1.6%) | 2I (1.4%) | 2A5a (1.4%) | 3B1b (1.3%) | 80.9% |
| PM10 | 2023 | 2A5b (21.8%) | 1A3bvi (12.4%) | 1A4bi (9.8%) | 2A5a (6.8%) | 3Dc (5.8%) | 5C2 (5.1%) | 1A3bvii (5.0%) | 1A2gviii (3.3%) | 2C1 (2.6%) | 3B4gii (2.0%) | 3B4giv (1.7%) | 5E (1.7%) | 1A3dii (1.6%) | 2A6 (1.3%) | 81.0% | |||
| TSP | 2023 | 2A5b (39.1%) | 1A3bvi (8.5%) | 2A5a (7.5%) | 1A4bi (5.9%) | 1A3bvii (5.4%) | 3Dc (3.1%) | 3B4gi (2.9%) | 5C2 (2.9%) | 2C1 (2.5%) | 3B4giv (2.5%) | 80.3% | |||||||
| BC | 2023 | 1A4bi (17.9%) | 1A3bvi (14.2%) | 5C2 (11.2%) | 1A3bi (7.4%) | 5E (6.9%) | 1A3dii (6.2%) | 1A2gviii (5.6%) | 1A4ai (4.7%) | 1A3bii (3.3%) | 1B1b (3.2%) | 80.8% | |||||||
| CO | 2023 | 1A2gvii (25.2%) | 1A3bi (15.8%) | 1A4bi (14.8%) | 1A4bii (6.4%) | 1A2a (4.7%) | 2C1 (4.1%) | 1A3dii (3.9%) | 1A2gviii (2.9%) | 1A1a (2.8%) | 80.7% | ||||||||
| Pb | 2023 | 1A3bvi (39.3%) | 2C1 (28.1%) | 1A3aii(i) (8.6%) | 1A2gviii (5.5%) | 81.4% | |||||||||||||
| Cd | 2023 | 2G (35.7%) | 1A2gviii (14.1%) | 2C1 (12.1%) | 1A4bi (12.1%) | 1A3bvi (4.6%) | 1A2d (4.4%) | 83.0% | |||||||||||
| Hg | 2023 | 1A1a (19.3%) | 5C1bv (11.0%) | 1A2gviii (10.9%) | 1A2f (9.9%) | 5A (9.8%) | 2C1 (6.1%) | 1A4bi (5.9%) | 1A3bi (4.2%) | 2C7c (3.6%) | 80.7% | ||||||||
| As | 2023 | 5C2 (65.5%) | 2C1 (16.1%) | 81.6% | |||||||||||||||
| Cr | 2023 | 1A3bvi (37.1%) | 5C2 (17.4%) | 2G (13.3%) | 2C1 (10.7%) | 1A1a (6.0%) | 84.5% | ||||||||||||
| Cu | 2023 | 1A3bvi (58.2%) | 2G (38.4%) | 96.6% | |||||||||||||||
| Ni | 2023 | 1A4bi (42.2%) | 2G (12.8%) | 1A2gviii (11.9%) | 1A3dii (7.5%) | 2C1 (4.6%) | 1A1a (3.4%) | 82.4% | |||||||||||
| Se | 2023 | 1A1a (35.5%) | 2G (16.6%) | 2A3 (12.1%) | 2C1 (7.2%) | 1A3bvi (3.6%) | 1A4bi (3.5%) | 1A2f (3.0%) | 81.5% | ||||||||||
| Zn | 2023 | 2G (29.4%) | 1A3bvi (25.3%) | 1A2gviii (19.3%) | 2C1 (12.7%) | 86.8% | |||||||||||||
| DIOX | 2023 | 5E (21.2%) | 1A4bi (21.0%) | 5C2 (17.8%) | 1A2gviii (10.5%) | 2C1 (8.2%) | 1A1a (3.2%) | 81.8% | |||||||||||
| PAH | 2023 | 1A4bi (84.2%) | 84.2% | ||||||||||||||||
| HCB | 2023 | 1A1a (90.1%) | 90.1% | ||||||||||||||||
| PCB | 2023 | 2K (42.0%) | 2C1 (21.8%) | 5C2 (17.4%) | 81.2% | ||||||||||||||
| Component | Year | Key categories (Sorted from high to low from left to right) | Total | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NOx | 2010 | 1A1a (19.8%) | 1A3bi (15.3%) | 1A3biii (14.2%) | 1A3dii (8.7%) | 1A1c (5.2%) | 1A3bii (5.1%) | 1A2gviii (4.0%) | 1A4cii (3.6%) | 1A4bi (3.5%) | 1A4ai (3.3%) | 82.8% | ||||||||
| NMVOC | 2010 | 2D3a (18.6%) | 2H2 (9.6%) | 2D3d (8.9%) | 1A3bi (7.4%) | 1B2b (4.0%) | 2D3i (4.0%) | 1B2ai (3.7%) | 3Da2a (3.4%) | 3B1b (3.4%) | 1B2av (2.9%) | 1A4bi (2.8%) | 1B2c (2.8%) | 3B1a (2.6%) | 1B1a (2.6%) | 1A3bv (2.3%) | 1B2aiv (2.2%) | 81.2% | ||
| SOx | 2010 | 1A1a (38.9%) | 1A2gviii (15.5%) | 1A1b (13.0%) | 1A3dii (6.9%) | 1B1b (4.3%) | 1A4bi (3.4%) | 82.1% | ||||||||||||
| NH3 | 2010 | 3Da2a (23.4%) | 3Da1 (15.6%) | 3B1b (14.7%) | 3B1a (11.4%) | 3Da3 (7.2%) | 6A (5.0%) | 1A3bi (4.5%) | 81.9% | |||||||||||
| PM2.5 | 2010 | 1A4bi (13.3%) | 1A3bvi (8.1%) | 1A3bi (6.5%) | 5C2 (6.2%) | 1A1a (5.2%) | 1A2gviii (4.6%) | 1A3dii (4.3%) | 1A3bii (4.2%) | 1A4cii (3.8%) | 2A5b (3.7%) | 1A3biii (3.6%) | 1A3bvii (3.3%) | 1A2gvii (3.1%) | 2C1 (3.0%) | 5E (2.4%) | 2G (2.4%) | 1A4ai (1.6%) | 1B2c (1.2%) | 80.6% |
| PM10 | 2010 | 2A5b (20.1%) | 1A3bvi (8.6%) | 1A4bi (7.4%) | 2A5a (6.5%) | 1A1a (4.3%) | 3Dc (4.3%) | 1A3bi (3.6%) | 5C2 (3.5%) | 1A3bvii (3.4%) | 2C1 (3.0%) | 1A2gviii (2.8%) | 1A3dii (2.4%) | 1A3bii (2.3%) | 1A4cii (2.1%) | 1A3biii (2.0%) | 2G (1.7%) | 1A2gvii (1.7%) | 3B4giv (1.5%) | 81.3% |
| TSP | 2010 | 2A5b (38.0%) | 2A5a (7.5%) | 1A3bvi (6.2%) | 1A4bi (4.7%) | 1A3bvii (3.8%) | 1A1a (3.3%) | 2C1 (3.1%) | 3Dc (2.5%) | 5C2 (2.1%) | 3B4gi (2.0%) | 1A3bi (2.0%) | 3B4giv (1.9%) | 1A2gviii (1.7%) | 3B4gii (1.6%) | 80.3% | ||||
| BC | 2010 | 1A3bi (18.8%) | 1A3bii (12.7%) | 1A4cii (9.3%) | 1A3biii (9.0%) | 1A2gvii (6.9%) | 1A3bvi (6.3%) | 1A4bi (5.8%) | 5C2 (5.1%) | 1A3dii (4.3%) | 5E (3.8%) | 81.9% | ||||||||
| CO | 2010 | 1A3bi (38.0%) | 1A2gvii (13.3%) | 1A4bi (9.5%) | 1A2a (5.8%) | 1A1a (3.6%) | 1A4bii (3.4%) | 2C1 (3.3%) | 1A3bii (2.3%) | 1A3biii (2.1%) | 81.2% | |||||||||
| Pb | 2010 | 1A3bvi (36.8%) | 2C1 (16.7%) | 1A3aii(i) (10.7%) | 1A2gviii (8.1%) | 2G (7.0%) | 2C7c (2.9%) | 82.2% | ||||||||||||
| Cd | 2010 | 2G (41.0%) | 2C1 (13.6%) | 1A2gviii (10.6%) | 1A4bi (6.4%) | 1A3bvi (4.9%) | 1A1a (3.0%) | 2C7c (2.7%) | 82.3% | |||||||||||
| Hg | 2010 | 1A1a (20.5%) | 5C1bv (12.0%) | 2B10a (11.5%) | 1A2gviii (9.3%) | 2C1 (5.3%) | 5A (5.1%) | 1A1b (4.5%) | 2C7c (3.8%) | 1A4bi (3.7%) | 1A2f (3.5%) | 1A2c (3.2%) | 82.3% | |||||||
| As | 2010 | 5C2 (52.4%) | 2C1 (20.8%) | 1A2gviii (5.8%) | 1A1a (4.6%) | 83.6% | ||||||||||||||
| Cr | 2010 | 1A3bvi (38.5%) | 5C2 (18.2%) | 2G (13.5%) | 2C7c (4.4%) | 2C1 (4.1%) | 1A1a (3.7%) | 82.5% | ||||||||||||
| Cu | 2010 | 1A3bvi (58.2%) | 2G (37.4%) | 95.6% | ||||||||||||||||
| Ni | 2010 | 1A2gviii (29.4%) | 1A3dii (18.5%) | 2G (10.0%) | 1A4bi (7.0%) | 1A4ai (6.3%) | 1A1b (5.3%) | 1A3bvi (2.6%) | 2C1 (2.5%) | 81.5% | ||||||||||
| Se | 2010 | 1A1a (37.5%) | 2A3 (28.5%) | 2G (8.1%) | 2C1 (5.8%) | 1A2f (3.1%) | 83.1% | |||||||||||||
| Zn | 2010 | 2G (26.7%) | 1A2gviii (25.7%) | 1A3bvi (22.5%) | 2C1 (13.8%) | 88.7% | ||||||||||||||
| DIOX | 2010 | 2C1 (27.8%) | 5E (19.4%) | 5C2 (13.5%) | 1A2gviii (8.5%) | 1A3bi (7.4%) | 1A4bi (5.7%) | 82.3% | ||||||||||||
| PAH | 2010 | 1A4bi (73.3%) | 5E (7.1%) | 80.3% | ||||||||||||||||
| HCB | 2010 | 3Df (66.7%) | 1A1a (24.9%) | 91.6% | ||||||||||||||||
| PCB | 2010 | 2K (73.3%) | 2C1 (11.5%) | 84.8% | ||||||||||||||||
| Component | Year | Key categories (Sorted from high to low from left to right) | Total | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NOx | 2005 | 1A1a (22.3%) | 1A3bi (16.8%) | 1A3biii (14.1%) | 1A3dii (7.9%) | 1A1c (4.4%) | 1A2gviii (4.1%) | 1A3bii (4.1%) | 1A4ai (3.1%) | 1A4cii (3.0%) | 1A4bi (2.8%) | 82.5% | |||||||||
| NMVOC | 2005 | 2D3a (12.8%) | 1A3bi (12.1%) | 2D3d (10.0%) | 1B2ai (7.0%) | 2H2 (6.8%) | 1B2av (4.0%) | 1B2b (3.7%) | 1A3bv (3.5%) | 2D3i (3.4%) | 2B10a (3.0%) | 3B1b (2.7%) | 1B2aiv (2.6%) | 3Da2a (2.5%) | 1B1a (2.5%) | 1A4bi (2.1%) | 3B1a (1.9%) | 80.4% | |||
| SOx | 2005 | 1A1a (50.9%) | 1A1b (9.9%) | 1A3dii (9.4%) | 1A2gviii (9.2%) | 1A4bi (2.8%) | 82.3% | ||||||||||||||
| NH3 | 2005 | 3Da2a (24.1%) | 3B1b (14.5%) | 3Da1 (13.3%) | 3B1a (10.1%) | 3Da3 (7.5%) | 1A3bi (6.2%) | 3B3 (5.2%) | 80.9% | ||||||||||||
| PM2.5 | 2005 | 1A4bi (10.5%) | 1A3dii (8.7%) | 1A3bvi (6.3%) | 1A3bi (5.6%) | 1A1a (5.5%) | 1A3biii (5.3%) | 5C2 (4.6%) | 1A3bii (4.4%) | 1A2gvii (4.3%) | 1A4cii (3.9%) | 2A5b (3.3%) | 1A2gviii (3.2%) | 2C1 (3.0%) | 1A3bvii (2.6%) | 5E (2.5%) | 2G (2.4%) | 2A6 (1.8%) | 1A4ai (1.8%) | 1A3eii (1.3%) | 81.0% |
| PM10 | 2005 | 2A5b (18.7%) | 2A5a (7.4%) | 1A3bvi (6.9%) | 1A4bi (6.0%) | 1A3dii (5.2%) | 1A1a (5.1%) | 3Dc (3.4%) | 1A3bi (3.2%) | 2C1 (3.1%) | 1A3biii (3.0%) | 5C2 (2.7%) | 1A3bvii (2.7%) | 1A3bii (2.5%) | 1A2gvii (2.4%) | 1A4cii (2.2%) | 1A2gviii (2.1%) | 2G (1.9%) | 2A6 (1.6%) | 80.2% | |
| TSP | 2005 | 2A5b (36.3%) | 2A5a (8.8%) | 1A3bvi (5.1%) | 1A1a (4.1%) | 1A4bi (3.9%) | 1A3bvii (3.2%) | 2C1 (3.1%) | 1A3dii (3.0%) | 3Dc (2.0%) | 1A3bi (1.8%) | 3B4gi (1.8%) | 1A3biii (1.7%) | 5C2 (1.7%) | 3B4giv (1.6%) | 1A3bii (1.5%) | 1A2gvii (1.4%) | 81.0% | |||
| BC | 2005 | 1A3bi (14.3%) | 1A3bii (12.2%) | 1A3biii (12.0%) | 1A2gvii (9.2%) | 1A4cii (9.1%) | 1A3dii (6.2%) | 1A3bvi (4.8%) | 1A4bi (4.5%) | 5C2 (4.0%) | 5E (3.7%) | 1A2gviii (3.0%) | 82.9% | ||||||||
| CO | 2005 | 1A3bi (45.2%) | 1A2gvii (13.7%) | 1A2a (7.4%) | 1A4bi (6.3%) | 1A3bii (2.8%) | 2C1 (2.7%) | 1A3biv (2.4%) | 80.6% | ||||||||||||
| Pb | 2005 | 1A3bvi (23.9%) | 2C1 (19.9%) | 1A3aii(i) (16.9%) | 2G (7.3%) | 2B10a (6.6%) | 1A2gviii (5.5%) | 80.1% | |||||||||||||
| Cd | 2005 | 2G (32.6%) | 2C1 (16.7%) | 1A1a (15.1%) | 1A2gviii (7.3%) | 1A4bi (5.2%) | 1A3bvi (3.9%) | 81.0% | |||||||||||||
| Hg | 2005 | 1A1a (28.0%) | 2B10a (14.0%) | 5C1bv (11.2%) | 2C1 (5.9%) | 1A2gviii (5.6%) | 2C7c (5.6%) | 5A (4.6%) | 1A4bi (3.8%) | 1A2f (3.7%) | 82.2% | ||||||||||
| As | 2005 | 5C2 (46.6%) | 2C1 (26.7%) | 1A2gviii (5.1%) | 1A4bi (3.5%) | 81.9% | |||||||||||||||
| Cr | 2005 | 1A3bvi (29.4%) | 2B10a (14.9%) | 5C2 (13.6%) | 2G (10.4%) | 1A1a (6.7%) | 2C1 (5.8%) | 80.8% | |||||||||||||
| Cu | 2005 | 1A3bvi (57.5%) | 2G (37.0%) | 94.5% | |||||||||||||||||
| Ni | 2005 | 1A2gviii (24.6%) | 1A4bi (23.6%) | 1A3dii (16.0%) | 2G (6.7%) | 1A1b (5.3%) | 1A1a (3.5%) | 2C3 (2.3%) | 82.1% | ||||||||||||
| Se | 2005 | 1A1a (43.9%) | 2A3 (33.1%) | 2C1 (5.7%) | 82.7% | ||||||||||||||||
| Zn | 2005 | 1A2gviii (25.6%) | 2G (24.3%) | 1A3bvi (20.4%) | 2C1 (17.6%) | 87.9% | |||||||||||||||
| DIOX | 2005 | 5E (25.1%) | 5C2 (25.0%) | 2C1 (17.9%) | 1A3bi (6.3%) | 1A4bi (5.6%) | 1A1a (3.6%) | 83.5% | |||||||||||||
| PAH | 2005 | 1A4bi (58.8%) | 5C2 (21.2%) | 80.0% | |||||||||||||||||
| HCB | 2005 | 3Df (54.3%) | 2B10a (32.9%) | 87.3% | |||||||||||||||||
| PCB | 2005 | 2K (81.0%) | 81.0% | ||||||||||||||||||