Published 16 Oct 2002
Last modified 13 Apr 2011, 07:16 PM
Levels of potentially harmful ground-level ozone exceeded a critical threshold somewhere in Europe on more than three days out of four this summer, according to preliminary information compiled by the European Environment Agency.
Ozone, the main component of summer smog, can cause serious health problems in humans and damage to ecosystems, agricultural crops and materials. It forms when certain air pollutants emitted by industry and transport react with sunlight. Ozone levels tend to be highest during warm, sunny weather, and are generally higher in southern Europe than in the north.
Our climate is changing. Scientific evidence shows that the global average temperature is rising, and rainfall patterns are shifting. It also shows that glaciers, Arctic sea-ice and the Greenland ice ...