"High IASI Metop-B Ash/Dust BTD (3 in [9.0, 12.8]) at (55N,170E) 22:13Z"

"2023-11-01 22:13Z granule 445"

"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)"
  54.57,  170.14,   12.79,    8.67,  256.63,  243.84
  54.26,  170.51,   10.52,    5.78,  266.00,  255.48
  54.77,  170.19,    9.00,    5.85,  265.84,  256.83