Natural Causes
An erupting volcano can also emit high levels of sulphur dioxide along with a large quantity of particulate matter; two key components to the creation of smog. However, the smog created as a result of a volcanic eruption is often known as "vog" to distinguish it as a natural occurrence.
The radiocarbon content of some plant life has been linked to the distribution of smog in some areas. For example; presence of Creosote bush in the Los Angeles area has been shown to have an effect on smog distribution that is more than fossil fuel combustion alone.
Read more about this topic: Smog
Famous quotes containing the word natural:
“Art is not tame, and Nature is not wild, in the ordinary sense. A perfect work of man’s art would also be wild or natural in a good sense.”
—Henry David Thoreau (1817–1862)
“Persecution produced its natural effect on them. It found them a sect; it made them a faction.”
—Thomas Babington Macaulay (1800–1859)