To answer, Mayo Clinic Health System physician Jennifer Johnson told Accuweather all snow carries a “risk of containing pollution, dirt, and microbes,” including freshly fallen snow, as it may have caught pollutants on the way down. The rule of thumb is to wait until it’s been snowing for a while so there are fewer pollutants in the air, and if you do eat it, make sure you do so in moderation to avoid illness.
