"High IASI Metop-B Ash/Dust BTD (4 in [9.00, 9.55]) at (54N,174E) 09:43Z"

"2023-11-02 09:43Z granule 195"

"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)"
  53.85,  173.66,    9.55,    8.95,  274.81,  265.26
  53.38,  173.77,    9.47,    7.50,  272.47,  263.01
  53.64,  173.71,    9.21,    8.38,  273.76,  264.56
  53.18,  173.83,    9.19,    7.98,  271.13,  261.94