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.