Dutch Butterfly Conservation produced an analysis in 2004 for the ETCNPB. This analysis was subcontracted and resulted to results and figures. These results and figures are free of copyrights for publications (edition, web, ...). Dutch Butterfly Conservation should be cited in any of these publications.
On very hot days use public transport rather than your car.
Car exhaust emissions react with sunlight and heat to cause polluting gases such as tropospheric ozone. This is the main ingredient of poor air quality and photo-chemical smog, which can cause breathing difficulties. To find out the level of ozone pollution across Europe, go to EEA's Live Ozone Map.
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