Scientists from McGill University in Canada simulated the effect in a “snow chamber,” according to Royal Society of Chemistry (RSC). Levels of toxic exhaust compounds like benzene, toluene, and xylene were first measured in the snow. Then, the chamber was exposed to an hour of exhaust fumes.
They found that the level of those toxic compound had risen from close to the “detection limit” to noticeable rates in the snow. One conclusion to draw was that living in a snowy environment was good for your health, as the snow drew the pollutants from the air you breathe, and that countries with snowfall might want to shovel it elsewhere before it melts.
“If the sink is temporary, pollutant emissions could increase rapidly in industrialised areas when snow melts,” study co-author Parisa Ariya told RSC.
But another is that you probably shouldn’t eat snow or lick the snowballs throw at your face in a snowball fight, so you don’t end up eating air pollutants.
Pesticides also find their way into the snow. Staci Simonich, a research at Oregon State University, found that high-elevation snow in some U.S. National Parks have pesticide levels 100 times of what’s deemed safe for drinking water, according to NPR.