Air pollution by ozone
- Ozone is both an important air pollutant and a GHG. Excessive exposure to ground-level ozone is estimated to cause about 20000 premature deaths per year in Europe.
- Attribution of observed ozone exceedances, or changes therein, to individual causes, such as climate change, is difficult.
- Future climate change is expected to increase ozone concentrations but this effect will most likely be outweighed by reduction in ozone levels due to expected future emission reductions.