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*[[Oil Power Plant]]s (this can be minimized with upgraded attachments)
*[[Garbage Dump]]s with the [[Garbage Incinerator]] attachment
*Region air pollution level - this is caused by air pollution that has exited cities in the region.
==Clean Up==
As mentioned air pollution blows with the wind, so if you remove the source buildings most of it will go away. However there are ways to remove it faster or combat it if you cannot remove the source buildings. If the air pollution seems random and enters from an unpolluted part of the city, it is because the region's air pollution level have accumulated to a high level. To combat this use one of these two methods.
*Trees
*Nature Parks
