 The average life expectancy is 81.8 (compared to an OECD average of 79.5), the 4th highest in the world.Iceland has a very low level of pollution, thanks to an overwhelming reliance on cleaner geothermal energy, a low population density, and a high level of environmental consciousness among citizens.According to an OECD assessment, the amount of toxic materials in the atmosphere is far lower than in any other industrialised country measured.