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The Asthma Wizard
Chapter 7: What Is a Peak Flow Meter? - Page 2

Hannah's peak flow meter goes to green

Hannah blows into the peak flow meter to see how well she is breathing. When Hannah is breathing well, she blows out fast. The peak flow number is high.

Hannah's meter goes to yellow

When Hannah is having trouble breathing, she blows out slow. The peak flow number is low.

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