re: That was lead fumes from cars . . .
The report was that we would be out of maple syrup by 1990. Switching to unleaded dropped the lead content in both our forests, and our fish.
There are still strong erosives in our atmosphere, resulting in the heavy pitting you might find in sidewalks and on rooftops. Not as bad as it once was, thanks to our cleaning up on emissions, but it's still there.
Cheers,
Dan
