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What causes ozone?

Ozone is created when the sun’s heat and light act upon gases and pollution in the air. It’s bad to breathe -- especially for people with asthma, and especially during May to September, the “ozone season” when ozone levels are highest.

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Is the Air in Your Home Polluted?
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How much air do I breathe in every minute?
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7 Ways to Improve Your Air Quality
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.