On 2-27-22, ALAR did a Prudhoe Bay flight.  It was a clear sky, sunny, poor-mixing kind of day, and smoggy around Deadhorse.  Shown below is a photo that shows an NO2-haze layer at the horizon.

The flight track with color-coded CO2 is shown below, with the box encircling the greatest density of oil&gas emission sources at Prudhoe Bay.

The King Air did a great cloud sampling flight over the Chukchi Sea on the 27th.