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Smog
Los Angeles CA, USA, July 2002

The word smog comes from smoke and fog which is technically a stratus cloud mixed with pollution. Today, unfortunately, smog is a problem in many of the world's big cities. Like here, the famous 'smog-city' of Los Angeles. You can just make out downtown L.A. through the smog.

Smog
Los Angeles CA, USA, July 1998

Sometimes a touch of yellow is found in the cloud, like here flying over Los Angeles.

Smog
Beijing, China, March 2000

Another city with pollution problems is Beijing. In fact, few days with clear skies in the Chinese capital are really blue. Instead this yellow colour is covering the sky where the sun is seen in a nasty blur.

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