| The smell of stagnant, rotting waters hung so thickly that the air was nearly unbreathable. |
| Newly painted walls, new carpets and new books create an atmosphere that's close to unbreathable. |
| In the time she was out, the air had become dense and almost unbreathable. |
| Does it make sense to, say, work overtime to save local green space when national policies create air so unbreathable it's unsafe to be outside on summer days? |
| He says the problem got so bad that it began affecting his asthma, to the point where the air in his apartment became unbreathable. |
| The air becomes unbreathable, and in one second they appear from every direction. |
