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I give Harold Henderson credit for trying to present an objective, balanced view of the scientific issues relating to particulate air pollution ["Up in the Air," April 18]. However, my confidence that he understood the relevant science well enough to do the job was undermined by a schoolboy error in the opening paragraphs. A microgram is one millionth of a gram, not one thousandth.

Barry Gehm

Highland Park

Harold Henderson replies:

I thank everyone who corrected my stupid mistake.

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