<p><span style="color: rgb(32, 33, 36); font-family: arial, sans-serif; font-size: 16px;">Ground-level ozone (O</span><sub style="color: rgb(32, 33, 36); font-family: arial, sans-serif;">3</sub><span style="color: rgb(32, 33, 36); font-family: arial, sans-serif; font-size: 16px;">), also known as surface-level ozone and tropospheric ozone, is a trace gas in the troposphere (the lowest level of the Earth`s atmosphere), with an average concentration of 20–30 parts per billion by volume (ppbv), with&nbsp;</span><b style="color: rgb(32, 33, 36); font-family: arial, sans-serif; font-size: 16px;">close to 100 ppbv in polluted areas</b><span style="color: rgb(32, 33, 36); font-family: arial, sans-serif; font-size: 16px;">.</span><br></p>

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<p style="max-width: var(--measure); padding: 0px; margin-top: var(--space); color: rgb(0, 61, 89); font-family: Stabil-grotesk, Helvetica, Arial, sans-serif; font-size: 18px;">Ozone depleting substances include:</p><ol><li style="max-width: var(--measure); padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: var(--spacing-4); margin: 0px; position: relative;">chlorofluorocarbons (CFCs)</li><li style="max-width: var(--measure); padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: var(--spacing-4); margin-top: var(--spacing-neg3); margin-right: 0px; margin-bottom: 0px; margin-left: 0px; position: relative;">hydrochlorofluorocarbons (HCFCs)</li><li style="max-width: var(--measure); padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: var(--spacing-4); margin-top: var(--spacing-neg3); margin-right: 0px; margin-bottom: 0px; margin-left: 0px; position: relative;">hydrobromoflurocarbons (HBFCs)</li><li style="max-width: var(--measure); padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: var(--spacing-4); margin-top: var(--spacing-neg3); margin-right: 0px; margin-bottom: 0px; margin-left: 0px; position: relative;">halons</li><li style="max-width: var(--measure); padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: var(--spacing-4); margin-top: var(--spacing-neg3); margin-right: 0px; margin-bottom: 0px; margin-left: 0px; position: relative;">methyl bromide</li><li style="max-width: var(--measure); padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: var(--spacing-4); margin-top: var(--spacing-neg3); margin-right: 0px; margin-bottom: 0px; margin-left: 0px; position: relative;">carbon tetrachloride</li><li style="max-width: var(--measure); padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: var(--spacing-4); margin-top: var(--spacing-neg3); margin-right: 0px; margin-bottom: 0px; margin-left: 0px; position: relative;">methyl chloroform.</li></ol><p style="max-width: var(--measure); padding: 0px; margin-top: var(--space); color: rgb(0, 61, 89); font-family: Stabil-grotesk, Helvetica, Arial, sans-serif; font-size: 18px;">They have been used as:</p><ol><li style="max-width: var(--measure); padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: var(--spacing-4); margin: 0px; position: relative;">refrigerants in commercial, home and vehicle air conditioners and refrigerators</li><li style="max-width: var(--measure); padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: var(--spacing-4); margin-top: var(--spacing-neg3); margin-right: 0px; margin-bottom: 0px; margin-left: 0px; position: relative;">foam blowing agents</li><li style="max-width: var(--measure); padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: var(--spacing-4); margin-top: var(--spacing-neg3); margin-right: 0px; margin-bottom: 0px; margin-left: 0px; position: relative;">components in electrical equipment</li><li style="max-width: var(--measure); padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: var(--spacing-4); margin-top: var(--spacing-neg3); margin-right: 0px; margin-bottom: 0px; margin-left: 0px; position: relative;">industrial solvents</li><li style="max-width: var(--measure); padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: var(--spacing-4); margin-top: var(--spacing-neg3); margin-right: 0px; margin-bottom: 0px; margin-left: 0px; position: relative;">solvents for cleaning (including dry cleaning)</li><li style="max-width: var(--measure); padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: var(--spacing-4); margin-top: var(--spacing-neg3); margin-right: 0px; margin-bottom: 0px; margin-left: 0px; position: relative;">aerosol spray propellants</li><li style="max-width: var(--measure); padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: var(--spacing-4); margin-top: var(--spacing-neg3); margin-right: 0px; margin-bottom: 0px; margin-left: 0px; position: relative;">fumigants.</li></ol>

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<span style="color: rgb(32, 33, 36); font-family: arial, sans-serif; font-size: 16px;">Ozone in the stratosphere protects life on Earth from harmful ultraviolet (UV) radiation and is therefore often called good ozone. This is in contrast to ozone in&nbsp;</span><b style="color: rgb(32, 33, 36); font-family: arial, sans-serif; font-size: 16px;">the troposphere</b><span style="color: rgb(32, 33, 36); font-family: arial, sans-serif; font-size: 16px;">, the lowest layer of the atmosphere, where it is an air pollutant and can be harmful to humans, animals and vegetation.</span>

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