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National Jewish Health Home > Disease Information > Diseases We Treat > Asthma Home > Kids and Asthma > Wizard > What Are Peak Flow Zones? - Page 2
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Here is a peak flow meter divided into zones. Click the peak flow meter to see the colored zones.
When your number is in the green zone, it means go - you are breathing fine.
When your number is in the yellow zone, it means slow down - tell a grown-up, you may need to take medicine.
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