When a fire is burning in Yosemite National Park, the park assesses the impacts from smoke. Using portable and stationary monitors, park scientists can measure how much particulate matter, created from the burning vegetation and other fuels, is in the air.
Particulate matter from smoke can impact visibility and affect human health. Over the last few days, air quality in Yosemite has varied from moderate to unhealthy. When air quality is unhealthy, it is recommended to limit strenuous activity outdoors.
See current air quality graphs and webcam images here:https://www.nps.gov/yose/learn/nature/aqmonitoring.htm
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