# The UK Urban NO2 Network \(UUNN\) Re Tender 2024

> A sourced UK public sector contract award published by Defra.

## Key facts

- Buyer: [Defra](/buyers/defra/contract-awards)
- Tender value: £1
- Published: 12 February 2025
- Contract start: 1 January 2025
- Contract end: 31 March 2030
- Stage: open_tender
- Procurement category: services
- Notice ID: e1479039-f0da-46ad-bffc-2e3c59c7b304-825707
- OCID: ocds-b5fd17-8cfee02a-91b5-4b9c-aa7f-2df82d6c1741

## Description

The procurement documents are available for unrestricted and full direct access, free of charge, at https://defra-family\.force\.com/s/Welcome Any questions, requests to participate or tender submissions must be submitted electronically via this portal\. 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 agreeme

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## Source

[View the original notice on Contracts Finder](https://www.contractsfinder.service.gov.uk/Notice/e1479039-f0da-46ad-bffc-2e3c59c7b304-825707)