Gas Analysers for Automatic Air Quality Monitoring Networks 2025

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The Environment Agency work to create better places for people and wildlife and support sustainable development. EA is an executive non-departmental body, sponsored by the Department for Environment, Food and Rural Affairs. For further information please visit Environment Agency - GOV.UK (Environment Agency - GOV.UK (www.gov.uk). The UK Automatic Urban and Rural Network (AURN) is the Environment Agency's compliance network for the reporting of pollutant concentrations the Air Quality Directive (AQD) 2008/50/EC. This was transposed by respective Air Quality Standard Regulations across the UK and the Devolved Administrations. The network provides measurements of a range of pollutants including Particulate size fractions (PM10 and PM2.5) and the following gases: oxides of nitrogen (NOX) (analysers that measure Nitrogen Monoxide (NO) and nitrogen dioxide (NO2)), ozone (O3), sulphur dioxide (SO2) and carbon monoxide (CO). Further details of the current network are available on http://uk-air.defra.gov.uk/. The Environment Agency on behalf of the Department for Environment, Food and Rural Affairs (Defra), Affiliated Local Authorities and Devolved Administrations is seeking to procure 4 gas analysers to measure the following gases: oxides of nitrogen (NOX), nitrogen dioxide (NO2), ozone (O3) and sulphur dioxide (SO2). The gas analysers will in general be used on the UK's largest Air Quality Monitoring Network the AURN and the associated Automatic London Network (ALN). The AURN and ALN currently consists of 158 NOX analysers, 92 O3 analysers, 28 SO2 and 7 CO analysers. These primarily consist of many Environment Agency owned instruments; however, some are owned by Local Authorities. The AURN is managed by two Central Management and Control Units (CMCUs). The current incumbent contractor is Bureau Veritas who manages the national CMCU, and the London CMCU known as the ALN. The CMCU contractors work together with a Quality Assurance and Quality Control (QAQC) teams operated by Ricardo AEA and NPL under contract to the Agency. These organisations have responsibility for commissioning, overseeing site changes and installations to ensure the delivery of data to meet legislative compliance requirements and to inform the general public on air pollution quality across the 48 UK air quality zones. The Environment Agency requires the supply and installation of the following air quality monitoring instruments: • Lot 1 - NOx and NO2 analyser which is compliant or equivalent with "BS EN 14211:2012 Ambient Air Quality" which uses the standard method for the measurement of the concentration of nitrogen dioxide and nitrogen monoxide by Chemiluminescent. • Lot 2 - SO2 analyser which is compliant or equivalent with "BS EN 14212:2012 Ambient Air Quality" which uses the standard method for the measurement of the concentration of sulphur dioxide by ultra-violet fluorescence.  • Lot 3 - Ozone analyser which is compliant or equivalent with "BS EN 14625:2012 Ambient Air Quality" which uses the standard method for the measurement of the concentration of ozone by ultraviolet photometry. 

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