排気ガス

1. Origins, structure, and basic meaning

• Structure: 排気ガス is read はいきがす and means gas discharged from an engine or similar equipment.
• Basic usage: It appears in contexts such as avoiding vehicle exhaust or describing its smell lingering in a garage.

2. Common pitfalls and similar expressions

• Emission and outlet
  • 排気ガス is the emitted gas, while 排気口(はいきこう) is the opening or outlet it comes from. 排気ガスのにおい refers to the smell of the exhaust.