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<p>Tampere is one of the largest cities in Finland with a population of 260,000. The air quality in Tampere has been measured since 2005 at up to four different air quality stations. This study is the first analysis of the 20-year data set (2005–2024), gathered primarily for regulatory purposes. This analysis covers typical air quality metrics: PM<sub>10</sub>, PM<sub>2.5</sub>, nitrogen oxides, and ozone, as well as particle number concentration and lung-deposited surface area concentration when available. Overall, Tampere has low levels of pollution, being mostly below the WHO 2021 air quality guidelines, and most pollutant concentrations have decreased over the past 20&#xa0;years. However, PM<sub>2.5</sub> concentrations have stabilized at around ~ 5&#xa0;ug/m<sup>3</sup> since 2019, and particle number concentrations have shown a slight increase at one measurement site. Analysis of monthly trends shows elevated PM<sub>10</sub> concentrations in springtime, caused mainly by studded tires grinding the road surface in combination with dry weather. NO<sub>x</sub> concentrations are highest during winter months, and the WHO 2021 annual guideline value (10&#xa0;µg/m3) is exceeded at near-traffic measurement stations. Based on our analysis, traffic remains the most important local source of air pollution in Tampere.</p> Graphical abstract <p></p>

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Towards Zero-Pollution Urban Environments: Long-Term Air Quality Trends in a Low-Pollution, Northern City

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月9日

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  • Veera Blankenstein,
  • Ville Silvonen,
  • Ari Elsilä,
  • Kati Skippari,
  • Mohamed Elsayed,
  • Hilkka Timonen,
  • Laura Salo,
  • Topi Rönkkö

摘要

Tampere is one of the largest cities in Finland with a population of 260,000. The air quality in Tampere has been measured since 2005 at up to four different air quality stations. This study is the first analysis of the 20-year data set (2005–2024), gathered primarily for regulatory purposes. This analysis covers typical air quality metrics: PM10, PM2.5, nitrogen oxides, and ozone, as well as particle number concentration and lung-deposited surface area concentration when available. Overall, Tampere has low levels of pollution, being mostly below the WHO 2021 air quality guidelines, and most pollutant concentrations have decreased over the past 20 years. However, PM2.5 concentrations have stabilized at around ~ 5 ug/m3 since 2019, and particle number concentrations have shown a slight increase at one measurement site. Analysis of monthly trends shows elevated PM10 concentrations in springtime, caused mainly by studded tires grinding the road surface in combination with dry weather. NOx concentrations are highest during winter months, and the WHO 2021 annual guideline value (10 µg/m3) is exceeded at near-traffic measurement stations. Based on our analysis, traffic remains the most important local source of air pollution in Tampere.

Graphical abstract