If this week’s smoky skies seem unprecedented, that’s not far wrong: Thanks to an unusually unfortunate weather pattern, Seattle just recorded its worst 24-hour air quality in almost two decades of recordkeeping.
University of Washington atmospheric scientist Cliff Mass called attention to the high levels in a blog post today. “I have been here a long time, and I have never seen anything this bad,” Mass wrote.
How bad is it? Mass said particulate readings from the Puget Sound Clean Air Agency’s Duwamish monitoring site have registered the worst 24-hour average air quality since the agency began keeping records in 2000.