Is there a scientific explanation why fart has bad smell?!

It comes from a butt. I've never smelled a butt, but I think it's safe to assume that anything that comes from a butt will always stink.

Flatulence begins in the intestines. Its a gas created when the body is breaking down waste. Waste is the body's garbage, so to speak. Does garbage smell good.? Health Question & Answer

---

---

Farts are composed mostly of methane gas. Methane gas smells like methane gas AKA FART SMELL. Simple.Health Question & Answer

---

---

Its the bacteria emitting the malodorous stench. Tiny bacterium exploding and flows out when you pass gas.Health Question & Answer

---

---

Because a fart is actually little particles of poo that go up ur nose and get disolved by the moist lining of ur nose! its true i learnt it in scienceHealth Question & Answer

---

---

Bhaaahaaa, funny question.

I think its some sort of chemical reaction with oxygen.Health Question & Answer

---

---