Peak Flow Zone Chart Make an Appointment Refer a Patient Ask a Question Reviewed by David Tinkelman, MD (April 01, 2012) A peak flow zone chart shows you how to check the effectiveness of your breathing. The following table shows an example of how these zones work. Your doctor can help you create a similar table for your own asthma. Green: 80-100% of your personal best Your breathing is good. You do not have any early warning signs or asthma symptoms. Take all your medicines every day, as your doctor tells you. Take your inhaler before exercise, as your doctor tells you. Yellow: Caution 60-80% of your personal best Runny, stuffy nose. Feel more tired. Chin or throat itches. Sneezing. Restless Red or pale face Coughing Dark circles under your eyes Use "rescue" medicine Recheck peak flows after 20-30 minutes Call your doctor, healthcare professional, or nurse care manager: if your peak flow is not back to the Green Zone if your peak flow drops into the Yellow Zone again in less that 4 hours. Red: Danger Below 60% of your personal best Cough, more at night Wheezing Chest feels tight or hurts Breathing faster than normal Get out of breath easily Use your quick-relief medicine by inhaler or nebulizer right away! Call your doctor or 911 NOW Peak Flow Meter Clinical Trials For more than 100 years, National Jewish Health has been committed to finding new treatments and cures for diseases. Search our clinical trials.