 Yuck! All that gross stuff? At the same time that it brings us life-giving oxygen, the air also carries pollution from car and bus exhaust, industrial waste, cigarette and cigar smoke, dust and many other things.
The air is a world traveler and does not observe national borders. It moves all around the planet, picking up stuff as it travels. Unfortunately, it doesn't know the difference between what's healthy and what's harmful.
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