Look at what is outlined in red in the picture below, and also check the appropriate image on the civ3.com gallery (page 4, 2nd down on left). There appears to be some white, fluffy stuff around this square, and this can also be seen on another square on the coast just above Tours. This is in the industrial age and there is nothing else I could see it could be. Are these polluted tiles, represented with the skulls on Civ2?
![Idea!](https://apolyton.net/core/images/smilies/idea.gif)
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