What causes tropospheric ozone?



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    Tropospheric ozone, or “bad” ground level ozone in the troposphere (“good” ozone is present in the stratosphere and protects life on earth from harmful UV radiation), is formed naturally by hydrocarbons released by plants and the soil, and when stratospheric ozone molecules enter the troposphere. However, tropospheric ozone has reached dangerous levels in certain parts of the globe due to human activities. Automobiles, power plants, and industrial complexes emit hydrocarbons and nitrogen oxides which react with UV to produce dangerous levels of tropospheric ozone.


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