Occurrence
Carbon monoxide occurs in various natural and artificial environments. Typical concentrations in parts per million are as follows:
| ppmv: parts per million by volume (note: volume fraction is equal to mole fraction for ideal gas only, see volume (thermodynamics)) | |
| Concentration | Source |
|---|---|
| 0.1 ppmv | Natural atmosphere level (MOPITT) |
| 0.5 to 5 ppmv | Average level in homes |
| 5 to 15 ppmv | Near-properly adjusted gas stoves in homes, modern vehicle exhaust emissions |
| 17 ppmv | Atmosphere of Venus |
| 100 to 200 ppmv | Exhaust from automobiles in the Mexico City central area |
| 700 ppmv | Atmosphere of Mars |
| 5,000 ppmv | Exhaust from a home wood fire |
| 7,000 ppmv | Undiluted warm car exhaust without a catalytic converter |
Read more about this topic: Carbon Monoxide
Famous quotes containing the word occurrence:
“One is absolutely sickened, not by the crimes that the wicked have committed, but by the punishments that the good have inflicted; and a community is infinitely more brutalised by the habitual employment of punishment than it is by the occasional occurrence of crime.”
—Oscar Wilde (1854–1900)