It isn't. Raindrops pick up airborne particles both during formation and on their way to the ground. Water distilled several times is the purest available, which is not to say purity is always best. That, too, would be a mistaken assumption.
It is far from the purest with new things such as acid rain which caused from Pollution andother things. Also rain water picks up jet fuel and many other impurities I have a while article on water impurities if your interested.
Rain water isn't the purest water, it is subject to the pollution in the air and the water .
Rain water is by no means pure. Water will absorb carbon dioxide and nitrous oxide making it acidic. Flies, bacteria, dust and mold will also stick to water droplets as they fall through the air. Bird feces will also end up in the collection container.
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