l-link">PurpleAir</a></p>
<p><a href="https://api.purpleair.com" class="external-link">PurpleAir API</a></p>
<p><a href="https://www2.purpleair.com/policies/terms-of-service" class="external-link">PurpleAir Terms of service</a></p>
<p><a href="https://www2.purpleair.com/pages/license" class="external-link">PurpleAir Data license</a></p>
<p><a href="https://www2.purpleair.com/pages/attribution" class="external-link">PurpleAir Data Attribution</a></p>
    </div>

    <div id="ref-examples">
    <h2>Examples</