It&#x27;s a very interesting project and quite attractive.<p>However as others mentioned it would be useful to see some sort of scale for the dots, scale for the colors, and specifics on those numbers. For example, I have no idea what &quot;Blue corresponds to levels below the W.H.O. yearly recommendations, light blue is below the W.H.O. daily recommendations etc.&quot; means... Does that mean &quot;In one day at a Blue dot you will breathe in a whole year&#x27;s worth of particulates, while at a light blue dot for one day you will breathe in one day&#x27;s worth of particulates?&quot;<p>As it stands, I will stick with aqicn.org for my Chinese pollution forecast simply because it has much more, more specific, information for me -- including intra-city maps. It would be more useful to me if there was perhaps a radio button where I could change between PM2.5 and NO2 for example.<p>It is very cool to see this on a worldwide scale though. And don&#x27;t US embassies have public air quality data that you can scrape to fill out things like Africa? Or is that just US embassies in China...?<p>Anyways, thanks for your efforts.