biostudies-literatureUnknown11(1)Espina-Martin PAmmonia (NH₃) gas is primarily an agriculture atmospheric pollutant, and measuring near-emission sources is essential for understanding NH₃ emission plumes. Sensors in theory are attractive alternative monitoring methods due to their high-time data resolution, size, and lower costs; however, there are metrological and technical challenges. NH₃ sensors operating in the subppm range (typical of near-emission source concentrations) are relatively new to the market, and while promising, there are metrological and technical challenges, especially in outdoor environments. Six NH₃ sensors were evaluated under field conditions at a poultry house emission simulation site, Whim Bog, Scotland (3.4 g of NH₃ min^-1). Five electrochemical ACS omega917-929https://www.ebi.ac.uk/biostudies/studies/S-EPMC12809547biostudies-literatureAre Ammonia Sensors Ready for Outdoor Use?PMC12809547Costello HDeshpande AGYeung KPearson CMullinger NJJones MRBraban CFHernandez CMLeeson SRNicoll RRedon NTwigg MMEspina-Martin PSpelman GfalseAre Ammonia Sensors Ready for Outdoor Use?Ammonia (NH₃) gas is primarily an agriculture atmospheric pollutant, and measuring near-emission sources is essential for understanding NH₃ emission plumes. Sensors in theory are attractive alternative monitoring methods due to their high-time data resolution, size, and lower costs; however, there are metrological and technical challenges. NH₃ sensors operating in the subppm range (typical of near-emission source concentrations) are relatively new to the market, and while promising, there are metrological and technical challenges, especially in outdoor environments. Six NH₃ sensors were evaluated under field conditions at a poultry house emission simulation site, Whim Bog, Scotland (3.4 g of NH₃ min^-1). Five electrochemical 2026-01-01T00:00:00Z2026 Jan2026-06-12T04:54:04.426Z2026-06-12T03:08:00.94ZS-EPMC128095474155252310.1021/acsomega.5c07873