As a massive wildfire chewed through tens of thousands of acres in California over the past week, smoke and ash billowed into nearby towns including Sparks — home to Tesla's Gigafactory in Nevada.
Overall air quality around the Tesla facility was ranked "unhealthy" to "very unhealthy" on Thursday and Friday with around 57 micrograms of fine particulate matter per cubic meter of air, according to the U.S. Air Quality Index.
When air quality is that poor, people of all ages are advised to seriously limit outdoor activities, and wear a mask outside to filter smoke and other pollutants.
Nevada Gigafactory HVAC filters have been upgraded to a MERV 13 level or higher over the past year to capture wildfire particulates.
California's Caldor Fire, for example, burned more than 220,000 acres in 2021, destroying homes, land and leading to hazardous air quality in surrounding areas including in Nevada.