We all hear the earth's "ozone" is depleting, but what is ozone? Simply put, there are two types of ozone. There's the ozone layer in the upper atmosphere that protects the earth and its inhabitants from the sun's harmful ultraviolet rays, and there's ground-level ozone, also known as tropospheric ozone, or smog. This pollutant may trigger a number of respiratory problems and forms when VOCs (volatile organic compounds) and NOx (nitrogen oxides) react in the presence of sunlight. Emissions from a variety of sources, including motor vehicles are some of the major sources of VOC and NOx.
Now you know!
The image above is a view of the ozone layer over the south pole 11/16/07. Source http://www.nasa.gov/ (Purple center indicates ozone hole).
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