US Dept of Commerce National Oceanic and Atmospheric Administration National Weather Service Safety 1325 East West Highway Silver Spring, MD 20910
The Clearing Index is an Air Quality/Smoke Dispersal Index used to regulate open burning and as input for other air quality decisions throughout Utah. The Clearing Index is defined as the Mixing Depth (depth of the mixed layer in 100s of feet above ground level) multiplied by the Transport Wind (average wind in the mixed layer in knots).
Warming affects air quality, too. Air pollution is causing the climate to change, and climate change is also causing air quality to change. Because of climate warming, the Earth experiences more extreme weather, such as heat waves and drought, which can negatively impact air quality.
When severe weather threatens, Environment Canada issues alerts that notify those in affected areas so that they can take steps to protect themselves and their property from harm. The type of alert issued depends on the severity and timing of the event. Special statements: issued to highlight significant weather or express uncertainty.