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  2. Ground-level ozone - Wikipedia

    en.wikipedia.org/wiki/Ground-level_ozone

    Ground-level ozone (O 3), 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 close to 100 ppbv in polluted areas.

  3. Ozone - Wikipedia

    en.wikipedia.org/wiki/Ozone

    Ground-level ozone pollution (tropospheric ozone) is created near the Earth's surface by the action of daylight UV rays on these precursors. The ozone at ground level is primarily from fossil fuel precursors, but methane is a natural precursor, and the very low natural background level of ozone at ground level is considered safe. This section ...

  4. Environmental Protection Agency delays new ozone pollution ...

    www.aol.com/news/epa-delays-ozone-pollution...

    The Environmental Protection Agency is delaying plans to tighten air quality standards for ground-level ozone — better known as smog — despite a recommendation by a scientific advisory panel ...

  5. National Ambient Air Quality Standards - Wikipedia

    en.wikipedia.org/wiki/National_Ambient_Air...

    In April 2023, the EPA finalized its "Good Neighbor Plan", which phases in tighter standards for NO x, using a cap and trade system during the summer "ozone season". This is intended to reduce ground-level ozone in non-attainment areas downwind of industrial sources like power plants, incinerators, and industrial furnaces, often in other states ...

  6. Ground-level ozone to create unhealthy air quality Thursday ...

    www.aol.com/ground-level-ozone-create-unhealthy...

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  7. What does an Air Quality Alert mean? What to know about it ...

    www.aol.com/does-air-quality-alert-mean...

    According to the United States Environmental Protection Agency, ground level ozone is the main ingredient in smog. It is a harmful air pollutant because of its effects on people and the environment.

  8. Ozone layer - Wikipedia

    en.wikipedia.org/wiki/Ozone_layer

    Ozone-oxygen cycle in the ozone layer. The photochemical mechanisms that give rise to the ozone layer were discovered by the British physicist Sydney Chapman in 1930. Ozone in the Earth's stratosphere is created by ultraviolet light striking ordinary oxygen molecules containing two oxygen atoms (O 2), splitting them into individual oxygen atoms (atomic oxygen); the atomic oxygen then combines ...

  9. Allotropes of oxygen - Wikipedia

    en.wikipedia.org/wiki/Allotropes_of_oxygen

    Tropospheric ozone is formed near the Earth's surface by the photochemical disintegration of nitrogen dioxide in the exhaust of automobiles. [10] Ground-level ozone is an air pollutant that is especially harmful for senior citizens, children, and people with heart and lung conditions such as emphysema, bronchitis, and asthma. [11]

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