Articles | Volume 25, issue 4
https://doi.org/10.5194/acp-25-2443-2025
https://doi.org/10.5194/acp-25-2443-2025
Measurement report
 | 
25 Feb 2025
Measurement report |  | 25 Feb 2025

Measurement report: The effects of SECA regulations on the atmospheric SO2 concentrations in the Baltic Sea, based on long-term observations on the Finnish island, Utö

Androniki Maragkidou, Tiia Grönholm, Laura Rautiainen, Juha Nikmo, Jukka-Pekka Jalkanen, Timo Mäkelä, Timo Anttila, Lauri Laakso, and Jaakko Kukkonen

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Cited articles

Ahlnäs, K.: Variations in Salinity at Utö 1911–1961, Geophysica, 8, 135–149, 1961. 
Andersson, C., Bergström, R., and Johansson, C.: Population exposure and mortality due to regional background PM in Europe – Long-term simulations of source region and shipping contributions, Atmos. Environ., 43, 3614–3620, https://doi.org/10.1016/j.atmosenv.2009.03.040, 2009. 
Anenberg, S., Miller, J., Henze, D., and Minjares, R.: A global snapshot of the air pollution-related health impacts of transportation sector emissions in 2010 and 2015, The International Council on Clean Transportation (ICCT), Washington, DC, USA, 1–48 pp., https://theicct.org/wp-content/uploads/2021/06/Global_health_impacts_transport_emissions_2010-2015_20190226.pdf (last access: 19 November 2023), 2019. 
Anttila, P. and Tuovinen, J.-P.: Trends of primary and secondary pollutant concentrations in Finland in 1994–2007, Atmos. Environ., 44, 38–49, 2010. 
Bank of Finland: Euro countries recovered from crisis at different paces, https://www.bofbulletin.fi/en/2018/1/euro-countries-recovered-from (last access: 30 October 2024), 2018. 
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Short summary
The Baltic Sea's designation as a sulfur emission control area in 2006, with subsequent regulations, significantly reduced sulfur emissions from shipping. Our study analysed air quality data from 2003 to 2020 on the island Utö and employed modelling, showing a continuous decrease in SO2 concentrations since 2003 and thus evidencing the effectiveness of such regulations in improving air quality. It also underscored the importance of long-term, high-resolution monitoring at remote marine sites.

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