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I climbed Cerro Carbón again with a group of friends. It was a cool winter's day and the air quality was particularly horrible. At street level it was just a misty gloomy day, but from the top of Carbón we could see that there was a disgusting layer of brown all over Santiago. The top of the layer was just below the top of Cerro Carbón, and we stayed on our island in the muck for quite a while, not wanting to go back down into the filthy air below.