9c4aee69-3693-4f18-97c8-ff740045f3de English ISO/IEC 8859-1 (also known as Latin 1) dataset dataset NERC EDS Environmental Information Data Centre Lancaster Environment Centre, Library Avenue, Bailrigg Lancaster LA1 4AP UK info@eidc.ac.uk https://eidc.ac.uk/ EIDC website The Environmental Information Data Centre (EIDC) is the UK's national data centre for terrestrial and freshwater sciences. information pointOfContact 2025-11-13T16:12:51 UK GEMINI 2.3 WGS 84 Ammonia concentrations from high-elevation Himalayan forests and a Sri Lankan tropical forest, 2022-2024 2025-04-03 publication https://catalogue.ceh.ac.uk/id/9c4aee69-3693-4f18-97c8-ff740045f3de 10.5285/9c4aee69-3693-4f18-97c8-ff740045f3de doi: Deshpande, A., Ellis, C., Pradhan, S.P., Sharma, S., Asad, S.A., Tshering, D., Wangchuk, K., Chatterjee, S., Weerakoon, B., Nissanka, S.P., Ganguly, D., Prabhashwara, T., Duarte, F., Stephens, A., Iwanicka, A., Sutton, M.A., Jones, M.R. (2025). Ammonia concentrations from high-elevation Himalayan forests and a Sri Lankan tropical forest, 2022-2024. NERC EDS Environmental Information Data Centre 10.5285/9c4aee69-3693-4f18-97c8-ff740045f3de [This dataset is embargoed until April 1, 2026]. The dataset contains field measurements of atmospheric ammonia under forest canopies in the Himalayas in India, Pakistan, Nepal and Bhutan and in a tropical forest in Sri Lanka between 2022 and 2024. Monthly mean atmospheric ammonia concentrations are provided from 33 sites across the five countries. This dataset provides the first ever empirical measurements of ammonia from South Asian forests and can be used to estimate ecological impact, inform policy decisions, validate atmospheric chemistry transport models and satellite data and design future air quality and ecological monitoring in the region. The ammonia concentration data was collected monthly by deploying passive citric acid-coated samplers at the study locations. Full details about this dataset can be found at https://doi.org/10.5285/9c4aee69-3693-4f18-97c8-ff740045f3de Deshpande, A. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk https://orcid.org/0000-0002-2095-1271 ORCID record ORCID is an open, non-profit, community-driven effort to create and maintain a registry of unique researcher identifiers and a transparent method of linking research activities and outputs to these identifiers. information author Ellis, C. Royal Botanic Garden Edinburgh CEllis@rbge.org.uk author Pradhan, S.P. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk author Sharma, S. Kathmandu University, Nepal subodh.sharma@ku.edu.np author Asad, S.A. COMSATS University, Pakistan saeed.asad@comsats.edu.pk author Tshering, D. Sherubtse College, Bhutan dendup608@gmail.com author Wangchuk, K. Sherubtse College, Bhutan kwangchuck.sherubtse@rub.edu.bt author Chatterjee, S. The Nature Conservancy, India sudipto4biodiversity@gmail.com author Weerakoon, B. University of Peradeniya buddhikavray@gmail.com author Nissanka, S.P. University of Peradeniya spnissanka@gmail.com author Ganguly, D. National Centre for Sustainable Coastal Management, India dipnarayan.ganguly@gmail.com author Prabhashwara, T. Dilmah Conservation tharindu.prabhashwara@dilmahconservation.org author Duarte, F. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk author Stephens, A. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk author Iwanicka, A. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk author Sutton, M.A. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk author Jones, M.R. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk author NERC EDS Environmental Information Data Centre info@eidc.ac.uk custodian NERC EDS Environmental Information Data Centre info@eidc.ac.uk publisher UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk owner Deshpande, A.G. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk https://orcid.org/0000-0002-2095-1271 ORCID record ORCID is an open, non-profit, community-driven effort to create and maintain a registry of unique researcher identifiers and a transparent method of linking research activities and outputs to these identifiers. information pointOfContact ammonia forest air pollution agriculture GEMET - Concepts, version 4.1.3 2019-01-28 creation Environmental survey South Asia Himalaya passive sampling otherRestrictions Embargoed otherRestrictions This resource is available under the terms of the Open Government Licence otherRestrictions If you reuse this data, you should cite: Deshpande, A., Ellis, C., Pradhan, S.P., Sharma, S., Asad, S.A., Tshering, D., Wangchuk, K., Chatterjee, S., Weerakoon, B., Nissanka, S.P., Ganguly, D., Prabhashwara, T., Duarte, F., Stephens, A., Iwanicka, A., Sutton, M.A., Jones, M.R. (2025). Ammonia concentrations from high-elevation Himalayan forests and a Sri Lankan tropical forest, 2022-2024. NERC EDS Environmental Information Data Centre https://doi.org/10.5285/9c4aee69-3693-4f18-97c8-ff740045f3de textTable English utf8 environment climatologyMeteorologyAtmosphere 2022-01-01 2024-12-31 66.269 93.873 3.864 34.235 Comma-separated values (CSV) NERC EDS Environmental Information Data Centre info@eidc.ac.uk distributor dataset dataset Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 Starting May 2022, triplicate sets of UKCEH Adapted Low-cost Passive High Absorption (ALPHA®) samplers were deployed under the forest canopy at sites buffered by at least 500 m of continuous forest on all sides. The exposed samplers were replaced with fresh ones at the end of each month. The exposed samplers from India, Nepal, Bhutan and Sri Lanka were analysed at the National Centre for Sustainable Coastal Management, Chennai and samplers from Pakistan were analysed at UKCEH, Edinburgh using the salicylate method. Blank samplers for each period were also analysed. The analysis provides the concentration of ammonium ions absorbed by each sampler. This is further converted to atmospheric ammonia concentration using an uptake rate which determined annually in the UK by co-locating the ALPHA samplers with UKCEH DEnuder for Long-Term Atmospheric sampling (DELTA®) samplers at multiple UK sites. The monthly concentration at each site is calculated as the average of the concentration measured by each sampler in the triplicate set. Obvious outliers are removed before calculating the average. Further quality assurance is performed based on comments from site operators regarding physical damage to the sampler, wet sampler, etc.