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Under the Clean Air Act, the EPA set protective health-based standards. Throughout the country, programs have been put in place to control bad ozone emissions, reformulate fuels, and to cut NOx and VOC emissions. Voluntary programs encourage people to adopt practices to reduce harmful emissions.

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Breathing in ozone can start up health problems such as chest pain, coughing, throat irritation, and congestion. It has worse long-term effects like reduced lung function, bronchitis, emphysema, and asthma.

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Ground level ozone is created by chemical interactions between nitrogen oxide and volatile organic compounds in sunlight. It comes from industrial facilities, electric utilities, motor vehicle exhaust, gasoline vapors, and chemical solvents.

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More than 180 countries have taken measures to prevent further depletion of stratospheric ozone. The EPA has established regulations to reduce the use of ODS. If the US and other countries stop producing ODS, natural ozone production should return stratospheric ozone levels to normal

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Ozone is a gas that occurs in both that Earth's upper atmosphere and at ground level.

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Good ozone is disappearing! It's being gradually destroyed by man-made chemicals that are referred to as ODS (ozone depleting substances) including CFCs, HCFCs, and others. It is estimated that 1 chlorine atom can destroy about 100,000 good ozone molecules.

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Stratospheric ozone is "good ozone". It protects us from harmful UV rays from the sun. This ozone layer is between 6 to 30 miles above the Earth's surface.