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 is cowardly to fly from natural duties and take up those that suit our taste or temperament better; but it is also unwise to take an exaggerated view of personal duties, which shuts out the proper care of the mind and body entrusted to us.”
—Ellen Henrietta Swallow Richards (1842–1911)
“Peter: I’ll bet there isn’t a good piggy-back rider in your whole family. I never knew a rich man yet who could piggy-back ride.
Ellie: You’re prejudiced.
Peter: You show me a good piggy-backer and I’ll show you a real human. Now you take Abraham Lincoln, for instance. A natural piggy-backer.”
—Robert Riskin (1897–1955)