Narrower Terms (10)

• ▶ Automobiles--Motors--Exhaust gas
• Blast furnace gas
• Coke-oven gas
• Diesel motor exhaust gas
• ▶ Flue gases
• Internal combustion engines--Exhaust gas
• Marine engines--Exhaust gas
• ▶ Smoke
• Spark ignition engines--Exhaust gas
• Two-stroke cycle engines--Exhaust gas