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At schools where livestock odor could be smelled inside at least twice a month, twenty-three percent more  students reported wheezing compared to students at schools with no odor.  Wheezing was 4% more common at schools within 3 miles of at least one hog facility than at schools farther from the facilities.

At schools near hog facilities:

  • 7% more students reported that a doctor told them they had asthma
  • 7% more students used asthma medication
  • 6% more students visited doctors or emergency rooms or were hospitalized for asthma

In general, these effects were greater for students with allergies than students without allergies.

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