--- title: "Precipitation Network and Rural Nitrogen Dioxide Network UKEAP- NO2 Net and Precip-Net" ocid: "ocds-h6vhtk-065660" canonical_url: "https://d3tenders.com/contract/?ocid=ocds-h6vhtk-065660" markdown_url: "https://d3tenders.com/contract/ocds-h6vhtk-065660.md" json_url: "https://d3tenders.com/contract/ocds-h6vhtk-065660.json" source: "Find A Tender Service" current_stage: "Planning" buyer: "ENVIRONMENT AGENCY" published: "2026-03-03" --- # Precipitation Network and Rural Nitrogen Dioxide Network UKEAP- NO2 Net and Precip-Net Buyer: ENVIRONMENT AGENCY Current stage: Planning OCID: ocds-h6vhtk-065660 [View canonical contract page](https://d3tenders.com/contract/?ocid=ocds-h6vhtk-065660) [Download OCDS JSON](https://d3tenders.com/contract/ocds-h6vhtk-065660.json) ## Summary The Environment Agency, based in London, is progressing through the planning stage for a procurement titled "Precipitation Network and Rural Nitrogen Dioxide Network UKEAP." This initiative is focused on Air Quality Management Services. Key engagement is scheduled until 31st March 2026, allowing suppliers to book 1:1 meetings starting 23rd March to better understand project requirements. The procurement process anticipates service provision within the UK, supporting compliance mapping across designated sites, with the contract due to span from November 2026 to October 2028, potentially extending until October 2030. This tender is expected to be above the threshold and accommodates small to medium-sized enterprises (SMEs), ensuring inclusivity. Businesses involved in air quality management services can find growth opportunities through this project, which falls under the services category. The extensive monitoring and analysis required for precipitation and rural nitrogen dioxide levels could be ideal for companies experienced in environmental data collection, chemical analysis, and ecosystem trend modelling. SMEs specialising in air quality solutions might benefit from competing for this contract, given its scalability and the UK's emphasis on improving ambient air quality compliance. Furthermore, the potential renewal option presents long-term prospects for businesses that can demonstrate robust capabilities and innovative approaches in tackling air quality challenges. ## Notice Precip Net: Precip-Net sites collect rainwater using standard bulk rainwater collectors on a fortnightly basis to measure the bulk deposition of both acidifying and eutrophying chemical species at 48 sites. This includes calcium, chloride, potassium, magnesium, sodium, phosphate, nitrate, ammonium, sulphate, non-marine sulphate, acidity, conductivity, pH and total rainfall levels. At the two UK EMEP Supersites, daily wet only collectors are operated and samples analysed for the same ions as the bulk samplers with the addition of fluoride. With the long term time series from this network, it is possible to do trend analysis and modelling of chemical deposition via rainfall to UK ecosystems. Precip-Net is measured via bottle collectors mounted on a pole. The samples are collected fortnightly by the Local Site Operators (LSOs), returned, processed and sent for analysis. The bottle collector has a funnel with a polypropylene mesh filter at the base to prevent coarse material entering the collection chamber. Bird deterrents are also located on the top of the funnels to try to minimise contamination from bird droppings. At Auchencorth Moss and Chilbolton (The two EMEP sites) daily wet only collections are also made. This is via a wet only sampler and is used towards meeting the UK's EMEP commitments. Ion analysis of the daily samples is undertaken, including: Na, NH4-N, K, Mg, Ca, Cl, NO3-N, SO4-S, PO4-P. In the daily samples fluoride (F-) is measured additionally. NO2 Net NO2-Net sites are a subset of the Precip-Net sites and are used to provide a rural background for the UK modelling of NO2 via the Defra Modelling Ambient Air Quality contract for annual compliance mapping at 26 sites. This supplements information delivered on a separate EA network, the Automatic Urban and Rural Network (AURN). Samples are taken using diffusion tubes. Three diffusion tubes with stainless steel grids mounted in low density polyethylene caps are used to collect the samples. The stainless steel grids are impregnated with an absorbent chemical (triethanolamine and acetone) which captures the NO2 as the gas diffuses through the tube. The tubes are left in situ for 4 weeks then analysed. Following a two-year intercomparison study during 2022 and 2023 comparing the performance of tubes with and without wind protection caps, the use of the tubes without the wind protection caps were discontinued and only those tubes with wind protection caps are now employed in the network. These tubes, provided by Gradko, are like those used in the UK Urban NO2 Network (UUNN Network). The wind protection caps help maintain the diffusion path length and hence reduces the positive sampling bias. ### Planning Information Further information (in the form of a presentation) is available by clicking the attached link. Responses to the presentation will help inform the Procurement Strategy and subsequent Bidder Pack. Please copy the following link into your browser and download the presentation. https://atamis-9529.my.salesforce.com/sfc/p/8d000003VQwd/a/Tu000007M9On/HIieiEVBcuI6iyn_.1xxw0mSeAJQE29N4Wo6cDWWwOQ Defra reserves the right to follow up with suppliers on a 1:1 basis to further understand their capabilities with regard to this requirement (with publication of any new information that arises). If you would like to book a 1:1 meeting regarding this project, (due to commence 23rd March 2026), please contact wayne.lamport@defra.gov.uk. expressing your interest in a 1:1 meeting. ## Key Details | Field | Value | | --- | --- | | Publication source | Find A Tender Service | | Latest notice | https://www.find-tender.service.gov.uk/Notice/019087-2026 | | Notice type | UK2 - Preliminary Market Engagement Notice | | Procurement type | Standard | | Procurement category | Services | | Procurement method | Not Specified | | Procurement method details | Not specified | | Tender suitability | SME | | Awardee scale | Not specified | | All stages | Planning | ## Dates | Field | Value | | --- | --- | | Publication date | 3 Mar 2026 | | Submission deadline | Not specified | | Future notice date | 5 May 2026 | | Award date | Not specified | | Contract period | 1 Nov 2026 - 31 Oct 2028 | | Recurrence | Not specified | ## Values | Field | Value | | --- | --- | | Tender value | £2,000,000 | | Lots value | Not specified | | Awards value | Not specified | | Contracts value | Not specified | ## Status | Field | Value | | --- | --- | | Tender status | Planned | | Lots status | Planned | | Awards status | Not specified | | Contracts status | Not specified | ## Buyer | Field | Value | | --- | --- | | Main buyer | ENVIRONMENT AGENCY | | Locality | LONDON | | Post town | South West London | | Postcode | SW1P 4DF | | Country | England | | ITL 1 | TLI London | | ITL 2 | TLI3 Inner London - West | | ITL 3 | TLI35 Westminster and City of London | | Local authority | Westminster | | Electoral ward | St James's | | Westminster constituency | Cities of London and Westminster | | Delivery location | Not specified | ## CPV Codes ### Divisions - 90 - Sewage, refuse, cleaning and environmental services ### Codes - 90731100 - Air quality management ## Release History - 3 Mar 2026 at 15:21 - PlanningUpdate - UK2 - Preliminary Market Engagement Notice - https://www.find-tender.service.gov.uk/Notice/019087-2026 - 3 Mar 2026 at 15:19 - PlanningUpdate - UK2 - Preliminary Market Engagement Notice - https://www.find-tender.service.gov.uk/Notice/019084-2026 - 19 Feb 2026 at 15:09 - PlanningUpdate - UK2 - Preliminary Market Engagement Notice - https://www.find-tender.service.gov.uk/Notice/015335-2026 - 17 Feb 2026 at 16:29 - Planning - UK2 - Preliminary Market Engagement Notice - https://www.find-tender.service.gov.uk/Notice/014499-2026 - 17 Feb 2026 at 15:40 - Planning - UK1 - Pipeline Notice - https://www.find-tender.service.gov.uk/Notice/014451-2026 ## Documents - https://www.find-tender.service.gov.uk/Notice/019087-2026 3rd March 2026 - Preliminary market engagement notice on Find a Tender - https://www.find-tender.service.gov.uk/Notice/019084-2026 3rd March 2026 - Preliminary market engagement notice on Find a Tender - https://www.find-tender.service.gov.uk/Notice/015335-2026 19th February 2026 - Preliminary market engagement notice on Find a Tender - https://www.find-tender.service.gov.uk/Notice/014499-2026 17th February 2026 - Preliminary market engagement notice on Find a Tender - https://www.find-tender.service.gov.uk/Notice/014451-2026 17th February 2026 - Pipeline notice on Find a Tender ## Notice URLs - https://atamis-9529.my.salesforce.com/sfc/p/8d000003VQwd/a/Tu000007M9On/HIieiEVBcuI6iyn_.1xxw0mSeAJQE29N4Wo6cDWWwOQ - https://defra-family.force.com/s/Welcome - https://www.legislation.gov.uk/ukpga/2023/54/contents ## Provenance This Markdown file is an alternate public rendering of the D3 Tenders contract record. The canonical page is https://d3tenders.com/contract/?ocid=ocds-h6vhtk-065660. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-h6vhtk-065660.json.