"High IASI Metop-C Ash/Dust BTD (4 in [9.0, 11.3]) at (56N,168E) 23:07Z"

"2023-11-01 23:07Z granule 463"

"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/m03/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)"
  56.42,  168.20,   11.31,    7.54,  256.62,  245.30
  53.71,  171.04,   10.46,    5.97,  270.85,  260.39
  53.87,  171.14,   10.05,    5.97,  266.73,  256.67
  54.32,  170.55,    9.31,    9.01,  264.63,  255.32