Days with poor air quality rare in Finland

Number of days on which 24-hour limit values for inhalable particles (PM10) were exceeded in 2008–2012.

Inhalable particles

Source: Air quality portal. 2013.

Limit values have been set for various air pollutants. Should these values be exceeded, the authorities must take action. The limit value most commonly broken in Finland is the 24-hour limit for inhalable particles (PM10), 50 µg/m3. The general public must be informed whenever the limits are exceeded, but for the actual threshold to be broken, the limit must be exceeded on more than 35 days per year. In recent years, we have remained well below this level.

Helsinki has led the way in reducing city air particle concentrations. The daily limit value was exceeded at least 35 times in Helsinki in 2003, 2005 and 2006. In 2008 and 2009, the figure was still over 30. Although the current limit value was not in force before 2001, it would have been exceeded in the city centre, at the Mannerheimintie measuring station in 1995 and 1998 at least.

Since 2009, the number of times the daily limit value for inhalable particles was exceeded at measuring stations in Helsinki has plummeted. At the worst location, the Mannerheimintie measuring station, the figure for 2012 was only seven.

In 2008, Helsinki prepared an action plan for air pollution control for 2008–2016. The plan includes a total of 43 actions – from influencing legislation to organising snow transportation – aimed at reducing concentrations of nitrogen dioxide (NO2), inhalable particles (PM10) and fine particles (PM2.5).


  • Air quality portal. 2013.
  • Helsingin kaupungin ilmansuojelun toimintaohjelma 2008–2016. Helsingin kaupungin ympäristökeskuksen julkaisuja 10/2008.
Published 2015-05-12 at 12:30, updated 2016-07-21 at 17:46