| 2024-08-15 | Banned chemical contaminant, for short |
| 2021-02-08 | Banned pollutant, in brief |
| 2020-01-12 | Banned pollutant, for short |
| 2018-05-14 | Banned pollutant, in brief |
| 2018-02-24 | Chemical contaminant, for short |
| 2013-05-13 | E.P.A.-proscribed compound, for short |
| 2012-06-04 | Banned organic compound, for short |
| 2011-03-20 | Environmental pollutant, for short |
| 2010-01-24 | Toxic chemical, for short |
| 2009-04-29 | Toxic pollutant, for short |
| 2007-08-26 | Outlawed pollutant, for short |
| 2001-05-07 | Chem. contaminant |
| 2000-03-18 | Wildlife threat, briefly |
| 2000-03-14 | Chem. pollutant |
| 1999-03-22 | Toxic compound, for short |
| 1994-09-01 | Banned chemical compound |
| 1994-03-26 | Toxic compound, for short |