Measurement report: Exploring the variations in ambient BTEX in urban Europe and their environmental health implications

Authors: X. Liu, X. Zhang, M. Dufresne, T. Wang, L. Wu, R. Lara, R. Seco, M. Monge, A. M. Yáñez-Serrano, M. Gohy, P. Petit, A. Chevalier, M.-P. Vagnot, Y. Fortier, A. Baudic, V. Ghersi, G. Gille, L. Lanzi, V. Gros, L. Simon, H. Héllen, S. Reimann, Z. Le Bras, M. J. Müller, D. Beddows, S. Hou, Z. Shi, R. M. Harrison, W. Bloss, J. Dernie, S. Sauvage, P. K. Hopke, X. Duan, T. An, A. C. Lewis, J. R. Hopkins, E. Liakakou, N. Mihalopoulos, A. Alastuey, X. Querol, T. Salameh

Source: Atmospheric Chemistry and Physics, Vol 25, Pp 625-638 (2025)

Subject Terms: Physics, QC1-999, Chemistry, QD1-999

File Description: electronic resource

Relation: https://acp.copernicus.org/articles/25/625/2025/acp-25-625-2025.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324

Access URL: https://doaj.org/article/ebac628409f7451da58ee7d6c6ff253b

Shipping and algae emissions have a major impact on ambient air mixing ratios of non-methane hydrocarbons (NMHCs) and methanethiol on Utö Island in the Baltic Sea

Authors: H. Hellén, R. Kouznetsov, K. Kraft, J. Seppälä, M. Vestenius, J.-P. Jalkanen, L. Laakso, H. Hakola

Source: Atmospheric Chemistry and Physics, Vol 24, Pp 4717-4731 (2024)

Subject Terms: Physics, QC1-999, Chemistry, QD1-999

File Description: electronic resource

Relation: https://acp.copernicus.org/articles/24/4717/2024/acp-24-4717-2024.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324

Access URL: https://doaj.org/article/b566f17352c54f1f983cc640be5b2098

Measurements of atmospheric C10–C15 biogenic volatile organic compounds (BVOCs) with sorbent tubes

Authors: H. Hellén, T. Tykkä, S. Schallhart, E. Stratigou, T. Salameh, M. Iturrate-Garcia

Source: Atmospheric Measurement Techniques, Vol 17, Pp 315-333 (2024)

Subject Terms: Environmental engineering, TA170-171, Earthwork. Foundations, TA715-787

File Description: electronic resource

Relation: https://amt.copernicus.org/articles/17/315/2024/amt-17-315-2024.pdf; https://doaj.org/toc/1867-1381; https://doaj.org/toc/1867-8548

Access URL: https://doaj.org/article/e0071254b9874814ac9683d6f1f8deee

Undetected biogenic volatile organic compounds from Norway spruce drive total ozone reactivity measurements

Authors: S. J. Thomas, T. Tykkä, H. Hellén, F. Bianchi, A. P. Praplan

Source: Atmospheric Chemistry and Physics, Vol 23, Pp 14627-14642 (2023)

Subject Terms: Physics, QC1-999, Chemistry, QD1-999

File Description: electronic resource

Relation: https://acp.copernicus.org/articles/23/14627/2023/acp-23-14627-2023.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324

Access URL: https://doaj.org/article/3460984b10b14003ae9cd64a548e66cd

Influence of anthropogenic emissions on the composition of highly oxygenated organic molecules in Helsinki: a street canyon and urban background station comparison

Authors: M. Okuljar, O. Garmash, M. Olin, J. Kalliokoski, H. Timonen, J. V. Niemi, P. Paasonen, J. Kontkanen, Y. Zhang, H. Hellén, H. Kuuluvainen, M. Aurela, H. E. Manninen, M. Sipilä, T. Rönkkö, T. Petäjä, M. Kulmala, M. Dal Maso, M. Ehn

Source: Atmospheric Chemistry and Physics, Vol 23, Pp 12965-12983 (2023)

Subject Terms: Physics, QC1-999, Chemistry, QD1-999

File Description: electronic resource

Relation: https://acp.copernicus.org/articles/23/12965/2023/acp-23-12965-2023.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324

Access URL: https://doaj.org/article/43b86298aad848948e60996a69fade7b

Characterization of volatile organic compounds and submicron organic aerosol in a traffic environment

Authors: S. Saarikoski, H. Hellén, A. P. Praplan, S. Schallhart, P. Clusius, J. V. Niemi, A. Kousa, T. Tykkä, R. Kouznetsov, M. Aurela, L. Salo, T. Rönkkö, L. M. F. Barreira, L. Pirjola, H. Timonen

Source: Atmospheric Chemistry and Physics, Vol 23, Pp 2963-2982 (2023)

Subject Terms: Physics, QC1-999, Chemistry, QD1-999

File Description: electronic resource

Relation: https://acp.copernicus.org/articles/23/2963/2023/acp-23-2963-2023.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324

Access URL: https://doaj.org/article/c7d59f3d19694aea90498123dcea9821

Seasonal and diurnal variations in biogenic volatile organic compounds in highland and lowland ecosystems in southern Kenya

Authors: Y. Liu, S. Schallhart, D. Taipale, T. Tykkä, M. Räsänen, L. Merbold, H. Hellén, P. Pellikka

Source: Atmospheric Chemistry and Physics, Vol 21, Pp 14761-14787 (2021)

Subject Terms: Physics, QC1-999, Chemistry, QD1-999

File Description: electronic resource

Relation: https://acp.copernicus.org/articles/21/14761/2021/acp-21-14761-2021.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324

Access URL: https://doaj.org/article/9560a044c5a54c548de11a715a18b619

Sesquiterpenes and oxygenated sesquiterpenes dominate the VOC (C5–C20) emissions of downy birches

Authors: H. Hellén, A. P. Praplan, T. Tykkä, A. Helin, S. Schallhart, P. P. Schiestl-Aalto, J. Bäck, H. Hakola

Source: Atmospheric Chemistry and Physics, Vol 21, Pp 8045-8066 (2021)

Subject Terms: Physics, QC1-999, Chemistry, QD1-999

File Description: electronic resource

Relation: https://acp.copernicus.org/articles/21/8045/2021/acp-21-8045-2021.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324

Access URL: https://doaj.org/article/438787a9b663419787299493c0a1a163

OH reactivity from the emissions of different tree species: investigating the missing reactivity in a boreal forest

Authors: A. P. Praplan, T. Tykkä, S. Schallhart, V. Tarvainen, J. Bäck, H. Hellén

Source: Biogeosciences, Vol 17, Pp 4681-4705 (2020)

Subject Terms: Ecology, QH540-549.5, Life, QH501-531, Geology, QE1-996.5

File Description: electronic resource

Relation: https://bg.copernicus.org/articles/17/4681/2020/bg-17-4681-2020.pdf; https://doaj.org/toc/1726-4170; https://doaj.org/toc/1726-4189

Access URL: https://doaj.org/article/7402c4fdf577450cb43006013f0f19d1

Optimisation of a thermal desorption–gas chromatography–mass spectrometry method for the analysis of monoterpenes, sesquiterpenes and diterpenes

Authors: A. Helin, H. Hakola, H. Hellén

Source: Atmospheric Measurement Techniques, Vol 13, Pp 3543-3560 (2020)

Subject Terms: Environmental engineering, TA170-171, Earthwork. Foundations, TA715-787

File Description: electronic resource

Relation: https://www.atmos-meas-tech.net/13/3543/2020/amt-13-3543-2020.pdf; https://doaj.org/toc/1867-1381; https://doaj.org/toc/1867-8548

Access URL: https://doaj.org/article/5216d4e33a8a438fa80d687a978bac62

Sesquiterpenes dominate monoterpenes in northern wetland emissions

Authors: H. Hellén, S. Schallhart, A. P. Praplan, T. Tykkä, M. Aurela, A. Lohila, H. Hakola

Source: Atmospheric Chemistry and Physics, Vol 20, Pp 7021-7034 (2020)

Subject Terms: Physics, QC1-999, Chemistry, QD1-999

File Description: electronic resource

Relation: https://www.atmos-chem-phys.net/20/7021/2020/acp-20-7021-2020.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324

Access URL: https://doaj.org/article/14bce8a399fb41c9a9b1b45de8f0ff9e

The influence of residential wood combustion on the concentrations of PM2.5 in four Nordic cities

Authors: J. Kukkonen, S. López-Aparicio, D. Segersson, C. Geels, L. Kangas, M. Kauhaniemi, A. Maragkidou, A. Jensen, T. Assmuth, A. Karppinen, M. Sofiev, H. Hellén, K. Riikonen, J. Nikmo, A. Kousa, J. V. Niemi, N. Karvosenoja, G. S. Santos, I. Sundvor, U. Im, J. H. Christensen, O.-K. Nielsen, M. S. Plejdrup, J. K. Nøjgaard, G. Omstedt, C. Andersson, B. Forsberg, J. Brandt

Source: Atmospheric Chemistry and Physics, Vol 20, Pp 4333-4365 (2020)

Subject Terms: Physics, QC1-999, Chemistry, QD1-999

File Description: electronic resource

Relation: https://www.atmos-chem-phys.net/20/4333/2020/acp-20-4333-2020.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324

Access URL: https://doaj.org/article/e7430309401b4482b6d29c0cd9883fc8

Long-term total OH reactivity measurements in a boreal forest

Authors: A. P. Praplan, T. Tykkä, D. Chen, M. Boy, D. Taipale, V. Vakkari, P. Zhou, T. Petäjä, H. Hellén

Source: Atmospheric Chemistry and Physics, Vol 19, Pp 14431-14453 (2019)

Subject Terms: Physics, QC1-999, Chemistry, QD1-999

File Description: electronic resource

Relation: https://www.atmos-chem-phys.net/19/14431/2019/acp-19-14431-2019.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324

Access URL: https://doaj.org/article/27ac57bbbdc9414ba59f5863ba02a30b

Technical note: Interferences of volatile organic compounds (VOCs) on methane concentration measurements

Authors: L. Kohl, M. Koskinen, K. Rissanen, I. Haikarainen, T. Polvinen, H. Hellén, M. Pihlatie

Source: Biogeosciences, Vol 16, Pp 3319-3332 (2019)

Subject Terms: Ecology, QH540-549.5, Life, QH501-531, Geology, QE1-996.5

File Description: electronic resource

Relation: https://www.biogeosciences.net/16/3319/2019/bg-16-3319-2019.pdf; https://doaj.org/toc/1726-4170; https://doaj.org/toc/1726-4189

Access URL: https://doaj.org/article/18e04547aa50451ea3dbd2a9f36e012e

Alkyl nitrates in the boreal forest: formation via the NO3-, OH- and O3-induced oxidation of biogenic volatile organic compounds and ambient lifetimes

Authors: J. Liebmann, N. Sobanski, J. Schuladen, E. Karu, H. Hellén, H. Hakola, Q. Zha, M. Ehn, M. Riva, L. Heikkinen, J. Williams, H. Fische, J. Lelieveld, J. N. Crowley

Source: Atmospheric Chemistry and Physics, Vol 19, Pp 10391-10403 (2019)

Subject Terms: Physics, QC1-999, Chemistry, QD1-999

File Description: electronic resource

Relation: https://www.atmos-chem-phys.net/19/10391/2019/acp-19-10391-2019.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324

Access URL: https://doaj.org/article/3726fcc1606045c1bfa2be5ec748e7a4

Accuracy of chikungunya case definition in patients with arbovirus illness seeking care in an urban emergency department in Rio de Janeiro, Brazil

Authors: H. Hellen, J. Moreira, C. Lamas, S. Cardozo

Source: International Journal of Infectious Diseases, Vol 101, Iss , Pp 264- (2020)

Subject Terms: Infectious and parasitic diseases, RC109-216

File Description: electronic resource

Relation: http://www.sciencedirect.com/science/article/pii/S1201971220324449; https://doaj.org/toc/1201-9712

Access URL: https://doaj.org/article/b42280a17a804f14a818b958a1d2d82e

Long-term measurements of volatile organic compounds highlight the importance of sesquiterpenes for the atmospheric chemistry of a boreal forest

Authors: H. Hellén, A. P. Praplan, T. Tykkä, I. Ylivinkka, V. Vakkari, J. Bäck, T. Petäjä, M. Kulmala, H. Hakola

Source: Atmospheric Chemistry and Physics, Vol 18, Pp 13839-13863 (2018)

Subject Terms: Physics, QC1-999, Chemistry, QD1-999

File Description: electronic resource

Relation: https://www.atmos-chem-phys.net/18/13839/2018/acp-18-13839-2018.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324

Access URL: https://doaj.org/article/c740333736d34a11b336d84a72da5a6f

Long-term dynamics of monoterpene synthase activities, monoterpene storage pools and emissions in boreal Scots pine

Authors: A. Vanhatalo, A. Ghirardo, E. Juurola, J.-P. Schnitzler, I. Zimmer, H. Hellén, H. Hakola, J. Bäck

Source: Biogeosciences, Vol 15, Pp 5047-5060 (2018)

Subject Terms: Ecology, QH540-549.5, Life, QH501-531, Geology, QE1-996.5

File Description: electronic resource

Relation: https://www.biogeosciences.net/15/5047/2018/bg-15-5047-2018.pdf; https://doaj.org/toc/1726-4170; https://doaj.org/toc/1726-4189

Access URL: https://doaj.org/article/1e4088deec884bcba7e3fd930087f6db

BAERLIN2014 – stationary measurements and source apportionment at an urban background station in Berlin, Germany

Authors: E. von Schneidemesser, B. Bonn, T. M. Butler, C. Ehlers, H. Gerwig, H. Hakola, H. Hellén, A. Kerschbaumer, D. Klemp, C. Kofahl, J. Kura, A. Lüdecke, R. Nothard, A. Pietsch, J. Quedenau, K. Schäfer, J. J. Schauer, A. Singh, A.-M. Villalobos, M. Wiegner, M. G. Lawrence

Source: Atmospheric Chemistry and Physics, Vol 18, Pp 8621-8645 (2018)

Subject Terms: Physics, QC1-999, Chemistry, QD1-999

File Description: electronic resource

Relation: https://www.atmos-chem-phys.net/18/8621/2018/acp-18-8621-2018.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324

Access URL: https://doaj.org/article/9cbb53741afd477a99789faed05b328a

Strong sesquiterpene emissions from Amazonian soils

Authors: E. Bourtsoukidis, T. Behrendt, A. M. Yañez-Serrano, H. Hellén, E. Diamantopoulos, E. Catão, K. Ashworth, A. Pozzer, C. A. Quesada, D. L. Martins, M. Sá, A. Araujo, J. Brito, P. Artaxo, J. Kesselmeier, J. Lelieveld, J. Williams

Source: Nature Communications, Vol 9, Iss 1, Pp 1-11 (2018)

Subject Terms: Science

File Description: electronic resource

Relation: https://doaj.org/toc/2041-1723

Access URL: https://doaj.org/article/e56d4242e3774126902019871d77f1ab