"High IASI Metop-B Ash/Dust BTD (3 in [9.0, 11.6]) at (55N,171E) 23:55Z"

"2023-11-01 23:55Z granule 479"

"Brightness temperature difference for channel 2347 (1231.5
cm-1) minus channel 2093 (1168 cm-1). High values almost
always indicate dust storms or volcanic eruptions.

See https://www.ospo.noaa.gov/pub/Atmosphere/Soundings/iasi/m01/alerts/ASH_BTD/index.html."

Latitude (N), Longitude (E), "Ash Brightness Temperature Difference", "SO2 Brightness Temperature Difference", "Brightness Temperature for Channel 2347 (1231.50 cm-1)", "Brightness Temperature for Channel 2093 (1168.00 cm-1)"
  55.04,  170.51,   11.56,    7.18,  255.69,  244.14
  53.60,  171.53,   10.83,    5.92,  261.29,  250.46
  53.37,  171.30,   10.21,    4.81,  266.45,  256.24