Air quality
In this section
Air Quality monitoring data
The reporting tools below can be used to analyse air quality data across the district for the last five years. Use our interactive tool to explore the data and view the data in table format by opening the blue boxes underneath.
Under Part IV of the Environment Act 1995 we have a legal duty to review and assess current and future air quality against air quality objectives established in the National Air Quality Strategy.
The data on this page has been approved and verified. To view live air quality data across Sussex, visit the Sussex Air website or the UK Air website. Live air quality data can also be accessed in real time on the Brighton & Hove and Sussex Real-Time Air Quality Portal.
To view UK Air Quality Limits, visit the Department for Environment Food and Rural Affairs (DEFRA) website.
View the data in table format
To view the data as tables, a format that is fully navigable by keyboard and screen reader, click the button below/open the blue boxes below.
The tables show the annual and monthly averages for Nitrogen Dioxide (NO2) and Particulate Matter (PM) in different areas of the District up to December 2025. For live data, visit the Sussex Air website.
If you have further questions about the data or how it is presented, please email Environmental Health.
Annual Average Air Quality
| Site Name | 2019 | 2020 | 2021 | 2022 | 2023 | UK objective |
|---|---|---|---|---|---|---|
| Ashington sites | ||||||
| Ashington 1 | - | - | - | 7.7 | - | 40 |
| Ashington 2 | - | - | - | - | 12.6 | 40 |
| Billingshurst sites | ||||||
| Billingshurst 1 | 22.2 | 20.3 | 19.7 | 15.6 | 15.2 | 40 |
| Billingshurst 2 | - | - | - | 12.4 | - | 40 |
| Billingshurst 3 | - | - | - | 10.8 | - | 40 |
| Billingshurst 4 | - | - | - | - | 12 | 40 |
| Billingshurst 5 | - | - | - | - | 12.7 | 40 |
| Broadbridge Heath sites | ||||||
| Broadbridge_Heath 1 | - | - | 10.2 | - | - | 40 |
| Broadbridge_Heath 1.1 | - | - | - | 11.5 | 13.1 | 40 |
| Cowfold sites | ||||||
| Cowfold 1, Cowfold 2 | 26.5 | 26.4 | 24.1 | 21.5 | 22.3 | 40 |
| Cowfold 3 | 26.5 | 25.5 | 24.1 | 21.9 | 19.9 | 40 |
| Cowfold 4 | 22.2 | 20.3 | 19.5 | 17.5 | 14.5 | 40 |
| Cowfold 5N | 21.3 | 20.3 | 18.7 | - | - | 40 |
| Cowfold 6N | 20.5 | 20.3 | 19.6 | 16.5 | 17.1 | 40 |
| Cowfold 7N | 31.2 | 31.7 | 28.3 | 24.9 | 25.6 | 40 |
| Cowfold 8N | 10.5 | 10.3 | 8.9 | 8.1 | 8.7 | 40 |
| Cowfold 9N | 18.3 | 18.7 | - | - | - | 40 |
| Cowfold 9N.1 | - | - | 18.2 | - | - | 40 |
| Cowfold AQMS | 20.3 | 21 | 24.6 | 16.2 | - | 40 |
| Faygate sites | ||||||
| Faygate 1 | - | - | - | 8.3 | - | 40 |
| Henfield sites | ||||||
| Henfield 1n | 20.9 | 18.2 | 18.2 | 16.6 | 16.9 | 40 |
| Horsham sites | ||||||
| A281_A24 | - | - | - | 11.8 | - | 40 |
| Horsham 1N | 23.2 | 22.6 | 20.9 | - | - | 40 |
| Horsham 3N | 9.9 | 8.8 | 7.6 | 7.2 | 7.8 | 40 |
| Horsham 4N | 9 | 8.7 | - | - | - | 40 |
| Horsham 5N | 22.7 | 21.6 | 20.4 | 18.1 | - | 40 |
| Horsham 6N | 19.5 | 17.6 | 15 | 14.3 | - | 40 |
| Horsham 6N.1 | - | - | - | - | 11.5 | 40 |
| Horsham 7N | 19.4 | 18.9 | 16.6 | 13.5 | 13.2 | 40 |
| Horsham 8N | 20.7 | 19.9 | 18.7 | 13.4 | 17.7 | 40 |
| Horsham 9N.1 | 23.3 | 24.1 | 20.3 | 17.3 | 17.5 | 40 |
| Horsham 12 | 33.4 | 29.7 | - | - | - | 40 |
| Horsham 12.1 | - | - | 20.1 | - | - | 40 |
| Horsham 12.2 | - | - | - | 22 | 24.2 | 40 |
| Horsham 13 | - | - | - | 8.6 | 10.3 | 40 |
| N. Horsham 1N | 17.6 | 13.9 | - | - | - | 40 |
| N. Horsham 2N | 14.6 | 14.1 | 14.1 | 11.9 | 11.4 | 40 |
| N. Horsham 3N | - | - | 26.2 | 21.7 | 26.4 | 40 |
| Horsham Park Way AQMS | 21.1 | 17.7 | 16.2 | 15.7 | 15.9 | 40 |
| Pulborough sites | ||||||
| A29_Pulborough1 | - | - | 8.1 | - | - | 40 |
| A29_Pulborough3 | - | - | 9.1 | - | - | 40 |
| A29_Pulborough4 | - | - | 9.2 | - | - | 40 |
| A29_Pulborough5 | - | - | 6.3 | - | - | 40 |
| Pulborough 1 | - | - | - | 16.2 | 17.4 | 40 |
| Pulborough 2 | 16.7 | 16.1 | 15.8 | 12.2 | 13.8 | 40 |
| Pulborough 3 | - | - | 14.7 | - | - | 40 |
| Pulborough 3.1 | - | - | - | 28.9 | 29.5 | 40 |
| Pulborough 4 | - | - | - | 35.1 | 34.7 | 40 |
| Southwater sites | ||||||
| Southwater 1 | 21.7 | 19.4 | 19 | - | - | 40 |
| Southwater 1.1 | - | - | - | 10.2 | 10.9 | 40 |
| Southwater 2 | - | - | - | 13.5 | 14.4 | 40 |
| Rusper sites | ||||||
| Rusper 1 | - | - | - | 11.4 | 12 | 40 |
| Steyning sites | ||||||
| Steyning 4N | 19 | 18.5 | 18.2 | 15.7 | 15.3 | 40 |
| Storrington sites | ||||||
| Storrington 1 | 24.3 | 32.9 | 32.9 | 28.6 | 27.5 | 40 |
| Storrington 3 | 24.8 | 23.7 | 21.8 | 19.3 | 19.6 | 40 |
| Storrington 4 | 25.9 | 26.7 | 24.5 | 23.3 | 23.1 | 40 |
| Storrington 5 | 19.9 | 19 | 19.2 | 16.4 | 16.8 | 40 |
| Storrington 6 | 17.1 | 17.4 | 17.9 | 15.9 | 16.6 | 40 |
| Storrington 7 | 17.6 | 17.7 | 18.8 | 15.9 | 15.2 | 40 |
| Storrington AURN | 20.1 | 17.6 | 17.4 | 16.6 | 15.7 | 40 |
| Storrington 11n | 26.5 | 25.9 | 24.8 | 20.7 | 20.6 | 40 |
| Storrington 12n | 23.0. | 22.4 | 20.9 | - | - | 40 |
| Storrington 13n | 23.1 | 23 | 21.1 | 18.4 | 19.1 | 40 |
| Storrington 14n | 15.8 | 26.3 | 23.5 | - | - | 40 |
| Storrington 14.1 | - | - | - | 26.1 | 26.3 | 40 |
| Storrington 15n | 15.4 | 14.6 | 14.7 | - | - | 40 |
| Storrington 16n | 19.2 | 18.4 | 17.5 | 15.1 | 17.3 | 40 |
| Storrington 17n | 10 | 9.6 | 8.2 | 7.6 | 8.5 | 40 |
| Storrington 18n | 18.1 | 15.4 | 13.7 | - | - | 40 |
| Storrington 19n | 39.6 | 38.1 | 37 | 32.7 | 35.2 | 40 |
| Site Name | 2021 | 2022 | 2023 | 2024 | 2025 | UK target by 2040 |
|---|---|---|---|---|---|---|
| Horsham Park Way | - | - | - | - | 9 | 10 |
| Storrington | - | 7.3 | 7.7 | 7.7 | 8.5 | 10 |
| Cowfold | - | - | - | - | 9.8 | 10 |
| Site Name | 2021 | 2022 | 2023 | 2024 | 2025 | UK Objective |
|---|---|---|---|---|---|---|
| Horsham Park Way | 17.5 | 19.3 | 20.5 | 16.1 | 13.6 | 40 |
| Storrington | - | 14 | 13.7 | 12.6 | 15.1 | 40 |
Monthly Average Air Quality
| Year | Month | Average Average of ug/m3 |
|---|---|---|
| 2021 | January | 21.2 |
| 2021 | February | 21.5 |
| 2021 | March | 21.4 |
| 2021 | April | 20.0 |
| 2021 | May | 16.9 |
| 2021 | June | 21.1 |
| 2021 | July | 15.9 |
| 2021 | August | 13.3 |
| 2021 | September | 21.8 |
| 2021 | October | 21.6 |
| 2021 | November | 25.9 |
| 2021 | December | 23.1 |
| 2022 | January | 27.8 |
| 2022 | February | 20.9 |
| 2022 | March | 23.3 |
| 2022 | April | 14.2 |
| 2022 | May | 15.7 |
| 2022 | June | 15.2 |
| 2022 | July | 18.3 |
| 2022 | August | 18.8 |
| 2022 | September | 14.1 |
| 2022 | October | 25.0 |
| 2022 | November | 27.3 |
| 2022 | December | 31.1 |
| 2023 | January | 29.5 |
| 2023 | February | 28.4 |
| 2023 | March | 30.5 |
| 2023 | April | 28.5 |
| 2023 | May | 19.7 |
| 2023 | June | 29.2 |
| 2023 | July | 34.8 |
| 2023 | August | 22.9 |
| 2023 | September | 19.2 |
| 2023 | October | 17.7 |
| 2023 | November | 18.2 |
| 2023 | December | 16.9 |
| 2024 | January | 21.9 |
| 2024 | February | 17.4 |
| 2024 | March | 20.1 |
| 2024 | April | 14.1 |
| 2024 | May | 16.4 |
| 2024 | June | 12.5 |
| 2024 | July | 13.7 |
| 2024 | August | 13.1 |
| 2024 | September | 13.5 |
| 2024 | October | 18.2 |
| 2024 | November | 18.8 |
| 2024 | December | 13.9 |
| Year | Month | Average Average of ug/m3 |
|---|---|---|
| 2024 | November | 9.3 |
| 2024 | December | 7.4 |
| 2025 | January | 14.0 |
| 2025 | February | 15.9 |
| 2025 | March | 17.0 |
| 2025 | April | 11.1 |
| 2025 | May | 7.9 |
| 2025 | June | 7.5 |
| 2025 | July | 7.1 |
| 2025 | August | 7.4 |
| 2025 | September | 5.2 |
| 2025 | October | 6.3 |
| 2025 | November | 6.7 |
| 2025 | December | 8.9 |
| Year | Month | Average Average of ug/m3 |
|---|---|---|
| 2021 | January | 22.5 |
| 2021 | February | 19.0 |
| 2021 | March | 22.9 |
| 2021 | April | 22.6 |
| 2021 | May | 16.5 |
| 2021 | June | 17.5 |
| 2021 | July | 17.7 |
| 2021 | October | 16.6 |
| 2021 | November | 27.6 |
| 2021 | December | 24.6 |
| 2022 | January | 13.8 |
| 2022 | March | 21.4 |
| 2022 | April | 17.2 |
| 2022 | May | 16.6 |
| 2022 | June | 13.9 |
| 2022 | July | 16.9 |
| 2022 | August | 16.2 |
| 2022 | September | 18.6 |
| 2022 | October | 16.3 |
| 2022 | November | 17.5 |
| 2022 | December | 30.1 |
| 2023 | January | 24.1 |
| 2023 | February | 21.1 |
| 2023 | March | 16.9 |
| 2023 | April | 18.9 |
| 2023 | May | 15.1 |
| 2023 | June | 12.4 |
| 2023 | July | 10.3 |
| 2023 | August | 12.1 |
| 2023 | September | 15.7 |
| 2023 | October | 15.2 |
| 2023 | November | 18.8 |
| 2023 | December | 14.6 |
| 2024 | January | 21.7 |
| 2024 | February | 15.2 |
| 2024 | March | 15.8 |
| 2024 | April | 12.6 |
| 2024 | May | 14.3 |
| 2024 | June | 11.8 |
| 2024 | July | 12.5 |
| 2024 | August | 12.6 |
| 2024 | September | 16.1 |
| 2024 | October | 18.1 |
| 2024 | November | 20.8 |
| 2024 | December | 17.0 |
| 2025 | January | 23.8 |
| 2025 | February | 22.5 |
| 2025 | March | 23.1 |
| 2025 | April | 17.9 |
| 2025 | May | 13.9 |
| 2025 | June | 11.5 |
| 2025 | July | 13.8 |
| 2025 | August | 12.3 |
| 2025 | September | 11.7 |
| 2025 | October | 14.1 |
| 2025 | November | 15.8 |
| 2025 | December | 15.6 |
| Year | Month | Average Average of ug/m3 |
|---|---|---|
| 2025 | January | 8.1 |
| 2025 | February | 17.0 |
| 2025 | March | 17.8 |
| 2025 | April | 10.9 |
| 2025 | May | 7.5 |
| 2025 | June | 6.9 |
| 2025 | July | 6.1 |
| 2025 | August | 7.0 |
| 2025 | September | 5.4 |
| 2025 | October | 5.9 |
| 2025 | November | 6.8 |
| 2025 | December | 8.6 |
| Year | Month | Average Average of ug/m3 |
|---|---|---|
| 2021 | January | 16.2 |
| 2021 | February | 20.1 |
| 2021 | March | 22.4 |
| 2021 | April | 20.7 |
| 2021 | May | 15.6 |
| 2021 | June | 17.4 |
| 2021 | July | 19.1 |
| 2021 | August | 12.4 |
| 2021 | October | 16.2 |
| 2021 | November | 16.8 |
| 2021 | December | 15.7 |
| 2022 | January | 22.1 |
| 2022 | February | 21.8 |
| 2022 | March | 23.8 |
| 2022 | April | 19.8 |
| 2022 | May | 16.0 |
| 2022 | June | 17.6 |
| 2022 | July | 19.1 |
| 2022 | August | 19.4 |
| 2022 | September | 17.5 |
| 2022 | October | 18.8 |
| 2022 | November | 18.0 |
| 2022 | December | 19.7 |
| 2023 | January | 18.8 |
| 2023 | February | 21.6 |
| 2023 | March | 17.0 |
| 2023 | April | 16.9 |
| 2023 | May | 23.8 |
| 2023 | June | 26.7 |
| 2023 | July | 19.4 |
| 2023 | August | 17.1 |
| 2023 | September | 22.7 |
| 2023 | October | 21.9 |
| 2024 | January | 24.7 |
| 2024 | February | 17.4 |
| 2024 | March | 16.1 |
| 2024 | April | 14.0 |
| 2024 | May | 16.3 |
| 2024 | June | 16.7 |
| 2024 | July | 14.4 |
| 2024 | August | 15.5 |
| 2024 | September | 14.1 |
| 2024 | October | 14.9 |
| 2024 | November | 17.6 |
| 2024 | December | 12.3 |
| 2025 | January | 12.0 |
| 2025 | February | 21.2 |
| 2025 | March | 25.0 |
| 2025 | April | 16.4 |
| 2025 | May | 12.5 |
| 2025 | June | 10.6 |
| 2025 | July | 10.2 |
| 2025 | August | 11.6 |
| 2025 | September | 9.4 |
| 2025 | October | 9.5 |
| 2025 | November | 11.1 |
| 2025 | December | 12.8 |
| Year | Month | Average Average of ug/m3 |
|---|---|---|
| 2021 | January | 20.2 |
| 2021 | February | 21.0 |
| 2021 | March | 22.8 |
| 2021 | April | 23.7 |
| 2021 | May | 16.9 |
| 2021 | June | 20.4 |
| 2021 | July | 17.7 |
| 2021 | August | 16.8 |
| 2021 | September | 21.7 |
| 2021 | October | 18.3 |
| 2021 | November | 24.3 |
| 2021 | December | 18.5 |
| 2022 | January | 25.3 |
| 2022 | February | 12.6 |
| 2022 | March | 24.0 |
| 2022 | April | 19.9 |
| 2022 | May | 17.5 |
| 2022 | June | 16.4 |
| 2022 | July | 18.5 |
| 2022 | August | 18.1 |
| 2022 | September | 20.6 |
| 2022 | October | 14.3 |
| 2022 | November | 13.9 |
| 2022 | December | 22.5 |
| 2023 | January | 21.1 |
| 2023 | February | 23.4 |
| 2023 | March | 16.6 |
| 2023 | April | 17.0 |
| 2023 | May | 19.1 |
| 2023 | June | 17.2 |
| 2023 | July | 13.3 |
| 2023 | August | 13.8 |
| 2023 | September | 16.4 |
| 2023 | October | 17.4 |
| 2023 | November | 18.1 |
| 2023 | December | 13.9 |
| 2024 | January | 20.9 |
| 2024 | February | 14.0 |
| 2024 | March | 16.9 |
| 2024 | April | 14.6 |
| 2024 | May | 18.7 |
| 2024 | June | 15.7 |
| 2024 | July | 13.9 |
| 2024 | August | 13.2 |
| 2024 | September | 18.5 |
| 2024 | October | 17.4 |
| 2024 | November | 21.5 |
| 2024 | December | 13.9 |
| 2025 | January | 17.4 |
| 2025 | February | 21.7 |
| 2025 | March | 24.2 |
| 2025 | April | 18.4 |
| 2025 | May | 14.4 |
| 2025 | June | 11.3 |
| 2025 | July | 13.1 |
| 2025 | August | 12.4 |
| 2025 | September | 12.7 |
| 2025 | October | 14.9 |
| 2025 | November | 14.9 |
| 2025 | December | 13.8 |
| Year | Month | Average Average of ug/m3 |
|---|---|---|
| 2022 | March | 12.2 |
| 2022 | April | 8.4 |
| 2022 | May | 6.6 |
| 2022 | June | 6.0 |
| 2022 | July | 5.1 |
| 2022 | August | 6.2 |
| 2022 | September | 5.3 |
| 2022 | October | 6.0 |
| 2022 | November | 6.9 |
| 2022 | December | 14.7 |
| 2023 | January | 10.5 |
| 2023 | February | 11.5 |
| 2023 | March | 8.3 |
| 2023 | April | 9.1 |
| 2023 | May | 7.7 |
| 2023 | June | 8.7 |
| 2023 | July | 5.1 |
| 2023 | August | 4.7 |
| 2023 | September | 7.1 |
| 2023 | October | 6.1 |
| 2023 | November | 6.6 |
| 2023 | December | 7.8 |
| 2024 | July | 4.6 |
| 2024 | August | 6.2 |
| 2024 | September | 6.6 |
| 2024 | October | 5.8 |
| 2024 | November | 11.3 |
| 2024 | December | 6.1 |
| 2025 | January | 6.8 |
| 2025 | February | 14.6 |
| 2025 | March | 16.7 |
| 2025 | April | 10.5 |
| 2025 | May | 7.1 |
| 2025 | June | 6.3 |
| 2025 | July | 5.4 |
| 2025 | August | 6.2 |
| 2025 | September | 5.3 |
| 2025 | October | 6.4 |
| 2025 | November | 6.6 |
| 2025 | December | 8.8 |
| Year | Month | Average Average of ug/m3 |
|---|---|---|
| 2022 | March | 21.6 |
| 2022 | April | 15.6 |
| 2022 | May | 12.7 |
| 2022 | June | 12.2 |
| 2022 | July | 11.9 |
| 2022 | August | 13.8 |
| 2022 | September | 11.3 |
| 2022 | October | 13.6 |
| 2022 | November | 13.4 |
| 2022 | December | 20.9 |
| 2023 | January | 16.1 |
| 2023 | February | 19.9 |
| 2023 | March | 15.1 |
| 2023 | April | 15.1 |
| 2023 | May | 14.2 |
| 2023 | June | 15.8 |
| 2023 | July | 10.4 |
| 2023 | August | 9.4 |
| 2023 | September | 13.2 |
| 2023 | October | 11.7 |
| 2023 | November | 12.5 |
| 2023 | December | 12.8 |
| 2024 | July | 9.2 |
| 2024 | August | 11.0 |
| 2024 | September | 12.1 |
| 2024 | October | 12.0 |
| 2024 | November | 18.9 |
| 2024 | December | 10.1 |
| 2025 | January | 10.0 |
| 2025 | February | 22.1 |
| 2025 | March | 27.8 |
| 2025 | April | 18.6 |
| 2025 | May | 13.8 |
| 2025 | June | 11.3 |
| 2025 | July | 10.8 |
| 2025 | August | 12.3 |
| 2025 | September | 11.1 |
| 2025 | October | 12.3 |
| 2025 | November | 13.1 |
| 2025 | December | 14.6 |