So I deleted the entire area, dezoned, filled the area with trees, and let it run for 5 years it helped a little but once I zoned it again it went down again.
The only radiation I have is the disease research and advanced research center.
I do have a clean air cheat lot.
I have fire stations and police stations in the area affected, and I put in a hospital and schools in th area but it just affected area where the building was put.