The determination of diffusive sampling rates to provide improved traceability for ambient ammonia measurements employing low cost passive sensors. - Martin, Nicholas A.; Ferracci, Valerio; Cassidy, Nathan; Hook, Josh; Battersby, Ross M.; Snook, Ieuan L. Barker; Berrow, Matthew J.; Tang, Yuk S.; Stephens, Amy C. M.; Leeson, Sara R.; Jones, Matthew R.; Braban, Christine F.; et al. (Geophysical Research Abstracts, 2018)