Question

What ppm does ${\mathrm{H}}_2\mathrm{S}$ stop smelling?

Answer 1

$\mathrm{ppm}$:

• $\mathrm{ppm}$ can be abbreviated as “parts per million” and is also expressed in milligrams per liter ($\mathrm{mg}/\mathrm{L}$).
• Hydrogen sulfide (${\mathrm{H}}_2\mathrm{S}$) is a colorless, flammable gas that smells like rotten eggs at lower concentration levels in the air.
• The odor of ${\mathrm{H}}_2\mathrm{S}$ cannot be detected above $100$parts per million ($100\mathrm{ppm}$).
• Hence, ${\mathrm{H}}_2\mathrm{S}$ stop smelling at $\mathbf{100}\mathbf{}\mathbf{ppm}$.