How to use on your website (parameters in red need to be edited!)

In your header:
<script src="https://www.lightpollutionmap.info/sqm/sqm-chart.js" type="text/javascript"></script>

In your body:
<div id="SQMGraphContent" data-gid=61 data-coordinates=[14.92399,45.80451] data-time=false data-stats=false ></div>