The amount of time that pollution remains in the air depends on what types of pollutants are in the air and how they may interact with each other. For example, it can take one molecule of CFC 100 years before it becomes harmless in the atmosphere. It also depends on how much of the pollutant is in the air and the means of removing it from the source, for example is it a crowded urban area or a relatively open, tree-ridden area.
It depends on the type of pollutants. CFCs can stay in the atmosphere anywhere from 22 to 111 years. They move up the atmosphere over time.
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