Winter weather in Reno is bringing more than just cold temperatures; it is also trapping pollution over the valley through a phenomenon known as a winter inversion. Experts say Reno’s unique geography plays a significant role in this occurrence. During winter, cold air settles near the ground while warmer air sits above, creating a lid that traps pollutants close to where people live and breathe.
“In the winter, Reno often sees clear skies, weak sunshine, and long nights,” said Tom Albright, Deputy Nevada State Climatologist. “Combined with snow-covered ground and the surrounding mountains, the valley acts like a bowl.” Albright explained that air typically warms from the ground up, but limited sunlight and snow cover prevent the ground from heating, keeping cold air trapped beneath warmer air above it. This allows pollution to build up, especially after major snowstorms. Warmer temperatures or strong winds are usually needed to break the inversion and clear the air.
While winter inversions are a natural weather pattern, experts warn that human behavior can exacerbate air quality issues. During an inversion, pollution from cars, fireplaces, and other sources becomes trapped near the ground. This includes PM2.5, fine particles small enough to travel deep into the lungs and pose serious health risks…