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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.
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 ...
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 ...
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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.
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 ...
Ground-level ozone can damage all types of green vegetation, including the foliage of trees. Ozone is absorbed by leaves and impedes plant growth. Ozone is recognised as the most serious regional air pollution problem for the agricultural sector in Europe. It reduces crop yields by hindering plant growth. In 2000, it was estimated that the ...
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