observing
In 2020, air quality was in the low health risk category over 97% of the time. While the region did experience impacts from wildfire smoke from outside the region, there were more hours in the low health risk category than in other years affected by wildfires (e.g., 2017, 2018).
* Changes are made to the AQHI formula as updated information about health risk is available. In 2016, adjustments were made to incorporate wildfire smoke health risk information