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I was glad to get a clear shot of Mt. Etna when on holiday last year, as the previous occasion she has been shrouded in a haze. You can smell the sulphur from where we are standing on the breeze slightly. Her last eruption was in 2002.
Here is the shot I took in 2009 when it was hazy:
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Check the above link for some great skyscapes and sky related photography from around the world.