| 2026-07-23 | Pollution portmanteau |
| 2026-07-21 | Urban environmental hazard |
| 2026-07-13 | Unhealthy haze |
| 2026-07-06 | Some urban pollution |
| 2026-07-03 | Environmental portmanteau |
| 2026-06-07 | Manufacturer's gross product? |
| 2026-05-21 | It's all a haze |
| 2026-05-14 | Ecological concern |
| 2026-02-03 | Skyline haze |
| 2026-01-23 | Environmental concern |
| 2026-01-07 | Unhealthy haze |
| 2025-07-17 | Environmental concern in Dr. Seuss's "The Lorax" |
| 2025-04-25 | Urban irritant |
| 2025-01-12 | Ecological portmanteau since 1905 |
| 2024-09-30 | Pollution that can change the colors of a sunset |
| 2024-09-02 | Pollution portmanteau |
| 2024-05-06 | Air pollution |
| 2023-12-29 | Air quality index factor |
| 2023-06-28 | Air quality concern |
| 2023-05-22 | Cause of low visibility in some cities |
| 2023-05-12 | It's hard to see through |
| 2023-03-16 | Possible cause of a cough |
| 2023-03-11 | Potential cause of a respiratory problem |
| 2022-11-17 | Unfresh air |
| 2022-10-19 | Q: What happens when the ___ clears over Los Angeles? A: UCLA! |
| 2022-07-04 | Urban air pollution |
| 2022-06-09 | Urban ill |
| 2022-05-25 | Cause of some breathing problems |
| 2022-04-30 | E.P.A. concern |
| 2022-02-08 | Atmospheric condition that can be caused by wildfires |
| 2022-01-16 | Delhi issue |
| 2021-12-27 | Pollution in city skies |
| 2021-11-05 | Emissions concern |
| 2021-09-12 | City hazard |
| 2021-07-21 | Overhead cost of manufacturing? |
| 2021-04-20 | Polluted air |
| 2020-09-11 | It's hardly a breath of fresh air |
| 2020-08-06 | Air apparent? |
| 2020-06-14 | Reason for a bad air day? |
| 2019-10-24 | Result of atmospheric inversion |
| 2019-08-26 | Skyline-obscuring pollution |
| 2019-04-30 | City choker |
| 2019-04-03 | Unwanted blanket |
| 2019-02-21 | Urban portmanteau |
| 2018-11-22 | Environmental concern |
| 2018-10-15 | Pollution from car emissions, in part |
| 2018-04-16 | Urban air pollution |
| 2017-04-09 | Environmental bane |
| 2017-02-10 | It's hardly a breath of fresh air |
| 2015-12-14 | Airborne urban hazard |
| 2015-10-12 | City haze |
| 2015-08-30 | Beijing problem |
| 2014-11-08 | Blanket produced in Mexico City |
| 2014-10-26 | Mexico City sight |
| 2014-08-02 | Dangerous blanket |
| 2014-02-25 | What can take your breath away in L.A.? |
| 2014-01-25 | Suffocating blanket |
| 2014-01-12 | Air apparent? |
| 2013-10-25 | Sun blocker |
| 2013-09-25 | Urban haze |
| 2012-11-04 | Environmental portmanteau |
| 2012-07-04 | Unwanted cloud |
| 2012-04-24 | Factor in an air quality rating |
| 2012-01-04 | Urban woe |
| 2011-11-03 | Subject of an exhaustive E.P.A. study? |
| 2011-01-24 | Urban pollution |
| 2010-12-08 | Urban woe |
| 2010-07-26 | Pollution that may sting the eyes |
| 2010-03-12 | Metropolitan hangover? |
| 2009-11-29 | Cough cause |
| 2009-07-12 | Eye irritant |
| 2009-06-16 | Air apparent? |
| 2009-05-29 | Cause of a bad air day? |
| 2009-04-10 | Gray blanket |
| 2009-03-02 | Air that makes you go [cough, cough] |
| 2009-02-04 | Air condition |
| 2008-06-16 | Cause of some urban coughs |
| 2007-06-28 | Possible cause of heavy breathing |
| 2006-11-07 | Kind of alert |
| 2005-12-13 | Urban pollution |
| 2005-06-16 | View blocker |
| 2005-02-18 | Big city problem |
| 2004-09-08 | It might make you short of breath |
| 2004-09-04 | It might hang over your head |
| 2004-08-23 | Urban haze |
| 2004-06-07 | Haze |
| 2004-01-28 | Clean Air Act target |
| 2003-04-07 | Urban haze |
| 2001-11-28 | Urban problem |
| 2001-09-11 | Cause of an air alert |
| 2001-09-05 | View disrupter |
| 2001-03-11 | It may be difficult to drive in |
| 2000-07-17 | Grimy air |
| 2000-07-14 | Unpleasant hangover? |
| 2000-06-14 | Scenery spoiler |
| 2000-04-10 | Target of clean air laws |
| 1999-11-28 | Portmanteau pollution mixture |
| 1999-10-20 | E.P.A. concern |
| 1999-08-24 | Los Angeles woe |
| 1999-06-10 | E.P.A. concern |
| 1999-04-12 | Air pollution |
| 1999-02-02 | Air apparent? |
| 1998-12-27 | Alert subject |
| 1998-11-23 | Some urban air |
| 1998-11-09 | Visibility reducer |
| 1998-09-02 | Urban blight |
| 1998-08-12 | Kind of alert |
| 1998-02-23 | Urban haze |
| 1997-06-02 | Urban haze |
| 1997-05-28 | Effect of auto exhaust |
| 1996-12-15 | Kind of alert |
| 1996-10-01 | City blight |
| 1996-08-12 | Air pollution |
| 1996-07-30 | Unwelcome cloud |
| 1996-02-03 | Kind of alert |
| 1996-01-15 | Health hazard |
| 1995-11-24 | Air apparent? |
| 1995-09-12 | Unhealthy air |
| 1995-04-28 | Urban problem |
| 1995-04-13 | Choking cause |
| 1994-03-06 | Urban miasma |