Ground-level ozone

Large concentrations of ground-level ozone constitute a risk factor, for instance, for people with respiratory problems. In Finland, the information threshold set by the EU for ground-level ozone may be exceeded in summer. This happens couple of times in decade on average.

The FMI draws up a bulletin or a warning if the ozone concentration in the lower atmosphere exceeds the limits determined in the relevant EU Directive. It is read together with weather forecasts on YLE Radio Suomi.

  • The information threshold is 180 micrograms/cubic metre.

  • The alert threshold is 240 micrograms/cubic metre. It is unlikely that the alert threshold would be exceeded in Finland.

More information about air quality.

Dust in the air in marina.
Photo: Sari Hartonen