European Volcanological Society President Henry Gaudru said yesterday that European authorities had no choice but to close much of their airspace for multiple days when volcanic ash drifted over the continent from Iceland (ATWOnline, April 22). He told Agence France Presse that scientists were unable to measure reliably the density of ash in the atmosphere outside the immediate vicinity of the eruption. "Closure to air traffic was the only measure that could be taken," he said, explaining ...

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