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 Environment Agency requires the supply and installation of the following air quality monitoring instruments: • 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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