A Portland roofing company will pay $1.45 million for air quality violations over a ten-year period. The fine is the largest penalty in the history of the Oregon Department of Environmental Quality.

One 3M customer, Malarkey Roofing (a top U.S. manufacturer of roofing shingles), said earlier this year it would incorporate the particles in all of its shingles. 3M says Malarkey’s products ...