21 August 2018 — 0738 mdt
Flathead filling with smoke again
Updated at 1151 MDT. By late afternoon yesterday, air quality in the Flathead was at “moderate” levels, down from the “very unhealthy” levels we experienced Sunday. This morning, the PM 2.5 concentration increased to over 100µg/m^3 again. Visibility is down, and the mercury sank to 37°F. Stepping outside provides an opportunity to cough in the cold. Here’s the time series plot of one-hour PM 2.5 values for the Flathead for 14 August through 1100 MDT this morning.
