"High IASI Metop-B Ash/Dust BTD (5 in [9.0, 12.0]) at (55N,164E) 08:25Z"

"2023-11-01 08:25Z granule 169"

"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)"
  55.33,  164.17,   11.96,   13.84,  248.91,  236.95
  53.09,  167.46,   10.62,   14.77,  255.12,  244.50
  53.29,  167.27,   10.37,   14.25,  256.43,  246.06
  53.52,  167.06,   10.18,   13.09,  251.24,  241.06
  52.87,  167.67,    9.60,   16.00,  257.18,  247.58