24 hour summary
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Key
- N/D
- Data not available
- N/M
- Data not measured
| Monitoring site | 8 Hour mean Ozone (µgm-3) | Hourly mean Nitrogen dioxide (µgm-3) | Max 15 min mean Sulphur dioxide (µgm-3) | Running 24 Hour mean PM2.5 Particles (µgm-3) | Running 24 Hour
                        mean PM10 Particles (µgm-3) | 
|---|---|---|---|---|---|
| Armagh Lonsdale Road 
                                Updated:
                                
                                31/10/2025 05:00
                             | N/M | 55 Low (1) | N/M | N/M | 12 Low (1) | 
| Ballymena Antrim Road 
                                Updated:
                                
                                31/10/2025 05:00
                             | N/M | 41 Low (1) | N/M | N/M | N/M | 
| Ballymena Ballykeel 
                                Updated:
                                
                                31/10/2025 05:00
                             | N/M | 38 Low (1) | N/A | 14 Low (2) | 18 Low (2) | 
| Belfast Centre 
                                Updated:
                                
                                31/10/2025 05:00
                             | 54 Low (2) | 52 Low (1) | 5 Low (1) | 8 Low (1) | 13 Low (1) | 
| Belfast Newtownards Road 
                                Updated:
                                
                                31/10/2025 06:00
                             | N/M | 49 Low (1) | N/M | N/M | N/M | 
| Belfast Stockman's Lane 
                                Updated:
                                
                                31/10/2025 05:00
                             | N/M | 77 Low (2) | N/M | N/M | 17 Low (2) | 
| Belfast Westlink Roden Street 
                                Updated:
                                
                                31/10/2025 06:00
                             | N/M | 78 Low (2) | N/M | N/M | N/M | 
| Castlederg 
                                Updated:
                                
                                31/10/2025 05:00
                             | N/M | N/M | N/M | 5 Low (1) | 9 Low (1) | 
| Castlereagh Dundonald 
                                Updated:
                                
                                31/10/2025 05:00
                             | N/M | 52 Low (1) | N/M | N/M | N/M | 
| Derry Dale's Corner 
                                Updated:
                                
                                31/10/2025 06:00
                             | N/M | 67 Low (1) | N/M | N/M | N/M | 
| Derry Rosemount 
                                Updated:
                                
                                31/10/2025 05:00
                             | 71 Low (3) | 32 Low (1) | 4 Low (1) | 2 Low (1) | 7 Low (1) | 
| Downpatrick Roadside 
                                Updated:
                                
                                31/10/2025 04:00
                             | N/M | 73 Low (2) | N/M | N/M | N/M | 
| Enniskillen Bowling Green 
                                Updated:
                                
                                31/10/2025 05:00
                             | N/M | N/M | N/M | 4 Low (1) | 8 Low (1) | 
| Limavady Dungiven 
                                Updated:
                                
                                31/10/2025 05:00
                             | N/M | 24 Low (1) | N/M | 5 Low (1) | 7 Low (1) | 
| Lisburn Dunmurry Seymour Hill 
                                Updated:
                                
                                31/10/2025 05:00
                             | N/M | N/M | 4 Low (1) | 6 Low (1) | 11 Low (1) | 
| Lough Navar 
                                Updated:
                                
                                31/10/2025 05:00
                             | 68 Low (3) | N/M | N/M | 4 Low (1) | 6 Low (1) | 
| Newry Canal Street 
                                Updated:
                                
                                
                             | N/M | 57 Low (1) | N/M | N/M | 22 Low (2) | 
| Newtownabbey Antrim Road 
                                Updated:
                                
                                31/10/2025 05:00
                             | N/M | 68 Low (2) | N/M | N/M | N/M | 
| Newtownstewart 
                                Updated:
                                
                                
                             | N/M | N/M | N/M | N/A | N/A | 
| North Down Holywood A2 
                                Updated:
                                
                                31/10/2025 05:00
                             | N/M | 61 Low (1) | N/M | 7 Low (1) | 12 Low (1) | 
| Strabane Springhill Park 
                                Updated:
                                
                                
                             | N/M | N/M | N/A | N/A | N/A | 
| Strathfoyle Bawnmore Place 
                                Updated:
                                
                                31/10/2025 06:00
                             | N/M | N/M | N/M | 4 Low (1) | 7 Low (1) |