Stratospheric Dust-Aerosol Event of November 1974

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Science  02 May 1975:
Vol. 188, Issue 4187, pp. 477-478
DOI: 10.1126/science.188.4187.477


A strong incursion of dust and aerosol at an altitude of 20 kilometers was noted over Baja California and southern Arizona in mid-November 1974, as indicated by bluish-ashen daylight skies and colorful twilight glows of the type usually associated with volcanic eruptions. Infrared satellite observations and reports from other sources eliminated a possible oceanic origin in the eastern Pacific. The stratum is probably from the extensive eruption of Volcan de Fuego in Gautemala in October 1974.