It was a cold day in Seoul, South Korea, when the unexpected came tumbling down. The year was 2006, and snow was falling across the capital. This snow, sprinkling sheets of itself across the country, ...

Freshly fallen snow can contain harmful chemicals and contaminants absorbed from the atmosphere. Snowflakes can pick up pollutants like nitrogen, sulfur, microplastics, and PFAS as they fall. A small ...