My feeling is if we can't eat snow due to pollution, we probably can't drink rainwater, or snowmelt that has run into dams and into our homes via our faucets. So, should we just curl up and die?

I guess we have to get used to the idea that nothing on this planet is pure any more. Below are two sites I found regarding this question.

Here is a pseudo-scientific opinion with a sort of test you can make of your local snow: http://library.thinkquest.org/3876/eat.html

Here is a more scientific report: http://www.theorganicreport.com/pages/419_is_it_safe_to_eat_snow_.cfm

Sue