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PU is an exaggerated pronunciation of pew, an interjection that is appropriate when you smell something foul.
Your nose knowsâthe smell of mercaptan is unmistakable. And thatâs exactly why it is added to natural gas, helping you detect even the smallest amount of natural gas leaking into the air. In its native state, natural gas is odorless, colorless and tasteless. Mercaptan, the harmless chemical that is added to natural gas, contains sulfur, which makes it smell. Many people describe the odor of mercaptan as similar to rotten eggs. When mercaptan is added to natural gas, it rises and dissipates much like the gas itself, making the two substances ideal companions.