More needs also to be done to explore the impacts of environmental degradation on human health and the associated distributional and equity issues, and identifying suitable indicators. These indicators should be read in connection with information on air emissions in urban areas, on socio-demographic patterns and on emission and fuel standards. Exposure to ozone has increased in the EU-27 between 2000 and 2007 by 2.5 % per year on average, with considerable variation from one year to the other.