| 2025-11-09 | Residue on Santa's suit |
| 2025-01-15 | Flue symptom? |
| 2024-11-28 | Flue residue |
| 2023-02-18 | Santa's coat? |
| 2021-11-05 | Emissions concern |
| 2021-11-01 | Chimney buildup |
| 2021-08-26 | Pipe buildup |
| 2021-01-12 | Santa's coat? |
| 2020-11-17 | Chimney coating |
| 2020-08-15 | It appears in stacks |
| 2020-03-01 | Annoyance for Santa |
| 2019-11-15 | Stain on Santa |
| 2019-07-16 | Flue buildup |
| 2019-04-06 | Flue problem |
| 2017-10-23 | Chimney buildup |
| 2016-11-09 | Chimney sweep's target |
| 2016-07-28 | Shade of black |
| 2016-03-13 | Fossil fuel residue |
| 2015-12-31 | Some air pollution |
| 2014-12-14 | Fire proof? |
| 2014-03-06 | Pipe buildup |
| 2014-01-25 | Diesel discharge |
| 2013-12-14 | Flue problem |
| 2013-07-09 | Chimney sweep's target |
| 2013-06-30 | Shade of black |
| 2013-02-28 | Shade of black |
| 2013-01-14 | Chimney black |
| 2012-12-23 | Santa's bootblack? |
| 2012-10-29 | Chimney sweep coating |
| 2012-10-06 | Sweep spots? |
| 2012-04-24 | It's found in stacks |
| 2010-12-26 | Lampblack |
| 2010-09-21 | Blackener of Santa's boots |
| 2010-03-08 | Chimney grime |
| 2009-12-05 | Film about a furnace |
| 2009-10-09 | Burning evidence |
| 2009-02-10 | Lampblack |
| 2008-12-03 | Blackener of Santa's suit |
| 2008-09-29 | Chimney buildup |
| 2008-09-13 | Symbol of blackness |
| 2008-08-09 | Stack buildup |
| 2008-05-15 | Some particulates |
| 2008-03-16 | Symbol of blackness |
| 2007-06-14 | Symbol of blackness |
| 2007-05-18 | Target of a sweep |
| 2007-05-07 | Chimney sweep's target |
| 2006-10-22 | Dirty coat |
| 2006-07-19 | Lampblack, essentially |
| 2006-05-20 | Shade of black |
| 2005-09-13 | Sweep's schmutz |
| 2005-08-04 | Epitome of blackness |
| 2005-03-20 | Pipe residue |
| 2004-04-18 | It's found in stacks |
| 2003-07-25 | It settles on sweeps |
| 2002-11-24 | Lampblack |
| 2002-05-23 | *Sweep ... coal ... Santa |
| 2002-05-06 | Chimney grime |
| 2002-04-12 | Dirty coat |
| 2001-01-13 | Pipe sullier |
| 2000-11-29 | Spot on Santa |
| 2000-10-17 | Chimney residue |
| 1999-12-31 | Smog contributor |
| 1999-10-10 | Grate stuff |
| 1999-06-29 | Santa soiler |
| 1999-06-18 | Flue buildup |
| 1999-05-28 | Lampblack |
| 1999-05-03 | Combustion byproduct |
| 1998-07-02 | Santa's coat? |
| 1998-06-21 | Santa's spot? |
| 1998-03-26 | Flue residue |
| 1997-12-02 | Chimney accumulation |
| 1997-09-25 | What chimney sweeps sweep |
| 1997-05-07 | Chimney covering |
| 1997-05-04 | Fire damage |
| 1997-03-28 | Lampblack |
| 1996-11-16 | Fly ash |
| 1996-06-21 | Air particulates |
| 1996-04-22 | Chimney dirt |
| 1995-08-07 | Chimney grime |
| 1995-03-19 | It's found in a stack |
| 1995-02-27 | Lampblack |
| 1994-06-28 | Stain on Santa |
| 1994-04-26 | Chimney grit |
| 1994-01-06 | Fly ash |