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<p>planets.</p>

<p><big>Environmental presence</big></p>
<p>Nitrogen dioxide typically arises via the oxidation of <a href="page.php?w=nitric_oxide">nitric oxide</a> by oxygen in air (e.g. as result of <a href="page.php?w=corona_discharge">corona discharge</a>):</p>

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:2 </p>

<p> is introduced into the environment by natural causes, including entry from the <a href="page.php?w=stratosphere">stratosphere</a>, bacterial respiration, volcanos, and lightning. These sources make  a <a href="page.php?w=trace_gas">trace gas</a> in the <a href="page.php?w=atmosphere_of_Earth">atmosphere of Earth</a>,</p><p>
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