Farms' clean bill of health from Johns Hopkins Bloomberg School of

Air pollution from agriculture, such as windblown dust, doesn't lead to emergency treatment in U.S. hospitals for people with breathing and heart complications as industrial contamination does, researchers said. Exposure to coarse particles between 2.5 micrometers (0.0001 inch) and 10 micrometers in diameter, which would likely collect in larger upper airways, didn't raise the risk for respiratory and cardiovascular admissions in research by doctors at the Johns Hopkins Bloomberg School of Public Health in Baltimore.

Results of the study were published Tuesday in the Journal of the American Medical Association.

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