S.M.O.G.: So Much Other Gunk
We depend on air to live. We breathe about 20,000 times a day. That means that in the last five minutes you've taken almost seventy breaths! Air carries oxygen, which is the most plentiful element on earth. Oxygen enters our bodies through the lungs. It passes through the lungs and into our blood. Our blood nourishes our bodies by carrying oxygen and nutrients to our organs! That is why clean air is so important to our health.
But sometimes air has a lot of other things in it that aren't very clean.
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