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:
“It would seem that man was born a slave, and that slavery is his natural condition. At the same time nothing on earth can stop man from feeling himself born for liberty. Never, whatever may happen, can he accept servitude; for he is a thinking creature.”
—Simone Weil (1909–1943)
“After school days are over, the girls ... find no natural connection between their school life and the new one on which they enter, and are apt to be aimless, if not listless, needing external stimulus, and finding it only prepared for them, it may be, in some form of social excitement. ...girls after leaving school need intellectual interests, well regulated and not encroaching on home duties.”
—Ellen Henrietta Swallow Richards (1842–1911)