I was reading the local newspaper this morning and saw an AP article explaining how the reduction in flights over Europe because of the Eyjafjallajoekull volcano in Iceland has led to the bluest skies in recent history. Evidently there are enough jet planes flying at high altitudes over Europe most days that there is a constant smog layer in the atmosphere from jet exhaust and contrails.
The “Information Is Beautiful” blog has an interesting infographic on the same subject:
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