Along with no shoveling and safer roads, we have a lot fewer inversions.
"During the winter, snow-covered valley floors reflect rather than absorb heat, preventing the normal vertical mixing of warm and cold air that keeps pollutants from building up to unhealthy levels at the surface."
Utah Department of Environmental QualityUnder normal atmospheric conditions, air is warmer near the ground and colder at higher altitudes. In a temperature inversion, the situation “inverts,” and cold air at the surface gets trapped under a layer of warmer air. During the winter, snow-covered valley floors reflect rather absorb heat, preventing the normal vertical mixing of warm and cold ...
https://deq.utah.gov/air-quality/inversions