Line chart showing the historical air pollution (PM 2.5) trends at air quality monitoring sites in Tahoe and Truckee, with each dot representing the highest daily average recorded from each year.
The Tahoe air monitoring site's PM 2.5 data was not available for years prior to 2013. 2020 and 2021 figures are preliminary. Readings are for the air monitor with the worst air quality in that air basin.