The Florida Department of Environmental Protection is looking into complaints about brown spots that are appearing on cars, boats, air conditioning units and other objects in a couple of cities.
Dozens of people complained to Springfield city officials in the last week or so, prompting them to ask the environmental agency to investigate.
Agency spokeswoman Brandy Smith says investigators have visited some of the larger nearby industrial facilities, but didn't find a potential source for the spots.
Charles Lewis tells The News Herald the spots went through the clear top coat on the hood of his new silver SUV and won't come off.
Springfield Mayor Ralph Hammond says so far no one has reported health issues.