I dunno where you are but I would be checking the jetstream before you do that man..or get a zeolite filter..there is direct nuclear fallout in the rain in many places all over the planet from fukashima when the jetstream lines up.
This is another reason in support of spring water..its been in the earth for thousands of year locked up inside aquafers..never even seeing pollution. It is the cleanest thing your body will probly ever see.
It is sad that it has come to this but I would just never be drinking rain water like that man unless I filtered it first through zeolite to remove all the pollutants in our world.
Boiling will not remove hot particles or many other pollutants. A zeolite filter is what you want.
Long live the unwoke.