---
title: "The UK Urban NO2 Network (UUNN) 2024"
ocid: "ocds-h6vhtk-04b0af"
canonical_url: "https://d3tenders.com/contract/?ocid=ocds-h6vhtk-04b0af"
markdown_url: "https://d3tenders.com/contract/ocds-h6vhtk-04b0af.md"
json_url: "https://d3tenders.com/contract/ocds-h6vhtk-04b0af.json"
source: "Find A Tender Service"
current_stage: "Award"
buyer: "ENVIRONMENT AGENCY (DEFRA NETWORK ETENDERING PORTAL)"
published: "2025-02-12"
---

# The UK Urban NO2 Network (UUNN) 2024

Buyer: ENVIRONMENT AGENCY (DEFRA NETWORK ETENDERING PORTAL)  
Current stage: Award  
OCID: ocds-h6vhtk-04b0af

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## Summary

The procurement process for the UK Urban NO2 Network (UUNN) 2024, led by the Environment Agency within the Defra Network, has reached the award stage. The tender, classified under the air quality management industry category, involves services aimed at monitoring NO2 levels across urban areas in the UK. This open procedure procurement seeks to enhance the national compliance assessment for air quality. Key dates include the award date on 12 February 2025 and the contract start date on 1 January 2025, with the contract running till 31 March 2030. The project is valued at £2,036,758.77, and the contract has been awarded to Ricardo-AEA Ltd.

This tender represents a significant opportunity for businesses engaged in environmental monitoring and data management. Companies specialising in air quality assessment, environmental technology, and related services will find this contract particularly beneficial. The project's focus on NO2 monitoring and compliance reporting could also present opportunities for firms offering innovative solutions to enhance data accuracy and reliability. Businesses with established capabilities in managing large-scale environmental projects and those ready to contribute to the UK's air quality improvement goals will be well-suited to compete and grow through such opportunities.

## Notice

The UUNN was first established in January 2020 and has expanded since to respond to evidence needs and is currently operating at ~299 sites.
The primary aim of the UUNN is the provision of additional NO2 monitoring data for inclusion within the national UK compliance assessment. Previously the national assessment of NO2 has comprised of a UK-wide automatic monitoring network; the Automatic Urban and Rural Network (AURN), and national scale modelling; the Pollution Climate Mapping (PCM) model.
UUNN monitors were sited specifically to target areas where modelling had indicated an exceedance of the annual mean NO2 limit value, and where concentrations predicted by the PCM model and by local modelling completed by a relevant local authority were not in good agreement.
The two requirements to identify specific road links for UUNN measurements within these areas were originally as follows:
# Where the PCM model and/or modelling completed by a relevant local authority had predicted an exceedance of the NO2 annual mean limit value of 40ug/m3 in 2020 and/or 2021.
# Where the difference between the PCM model and modelling completed by a relevant local authority is larger than 20%.
The Network continues to evolve, and now the aims are move generalised benefits rather than the original aims, although the limit of annual mean exceedance of 40ug/m3 is still a key reporting marker.

### Lot Information

Lot 1

The UUNN was first established in January 2020 and has expanded since to respond to evidence needs and is currently operating at ~299 sites.
The primary aim of the UUNN is the provision of additional NO2 monitoring data for inclusion within the national UK compliance assessment. Previously the national assessment of NO2 has comprised of a UK-wide automatic monitoring network; the Automatic Urban and Rural Network (AURN), and national scale modelling; the Pollution Climate Mapping (PCM) model.
UUNN monitors were sited specifically to target areas where modelling had indicated an exceedance of the annual mean NO2 limit value, and where concentrations predicted by the PCM model and by local modelling completed by a relevant local authority were not in good agreement.
The two requirements to identify specific road links for UUNN measurements within these areas were originally as follows:
# Where the PCM model and/or modelling completed by a relevant local authority had predicted an exceedance of the NO2 annual mean limit value of 40ug/m3 in 2020 and/or 2021.
# Where the difference between the PCM model and modelling completed by a relevant local authority is larger than 20%.
The Network continues to evolve, and now the aims are move generalised benefits rather than the original aims, although the limit of annual mean exceedance of 40ug/m3 is still a key reporting marker.
The primary aim of the UUNN is now to
i) supplement the current national assessment for air quality (which is comprised of the Automatic Urban and Rural Network (AURN) and Pollution Climate Mapping (PCM) model) to provide additional local NO2 monitoring data for the national UK compliance report.
ii) UUNN monitoring was sited specifically to target areas where local monitoring had indicated a potential exceedance of the annual mean NO2 limit value,
iii) and where concentrations predicted by the PCM model and by local modelling (completed by a relevant local authority) were not in good agreement.

## Key Details

| Field | Value |
| --- | --- |
| Publication source | Find A Tender Service |
| Latest notice | https://www.find-tender.service.gov.uk/Notice/004773-2025 |
| Notice type | Tender Notice |
| Procurement type | Standard |
| Procurement category | Services |
| Procurement method | Open |
| Procurement method details | Open procedure |
| Tender suitability | Not specified |
| Awardee scale | Large |
| All stages | Tender, Award |

## Dates

| Field | Value |
| --- | --- |
| Publication date | 12 Feb 2025 |
| Submission deadline | 20 Nov 2024 |
| Future notice date | Not specified |
| Award date | 23 Dec 2024 |
| Contract period | 1 Jan 2025 - 31 Mar 2030 |
| Recurrence | Not specified |

## Values

| Field | Value |
| --- | --- |
| Tender value | Not specified |
| Lots value | Not specified |
| Awards value | Not specified |
| Contracts value | £2,036,758 |

## Status

| Field | Value |
| --- | --- |
| Tender status | Complete |
| Lots status | Cancelled |
| Awards status | Active |
| Contracts status | Active |

## Buyer

| Field | Value |
| --- | --- |
| Main buyer | ENVIRONMENT AGENCY (DEFRA NETWORK ETENDERING PORTAL) |
| 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 |

## Supplier

| Field | Value |
| --- | --- |
| Number of suppliers | 1 |
| Supplier names | RICARDO-AEA |

## CPV Codes

### Divisions

- 90 - Sewage, refuse, cleaning and environmental services

### Codes

- 90731100 - Air quality management

## Release History

- 12 Feb 2025 at 15:10 - Award - Award Notice - https://www.find-tender.service.gov.uk/Notice/004773-2025
- 5 Nov 2024 at 10:48 - TenderUpdate - Tender Notice - https://www.find-tender.service.gov.uk/Notice/035755-2024
- 23 Oct 2024 at 15:37 - Tender - Tender Notice - https://www.find-tender.service.gov.uk/Notice/034371-2024

## Notice URLs

- https://defra-family.force.com/s/Welcome
- https://www.gov.uk/government/organisations/department-for-environment-food-rural-affairs
- https://www.gov.uk/government/publications/public-procurement-review-service-scope-and-remit

## 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-04b0af. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-h6vhtk-04b0af.json.