"I used to use that when I lived in Beijing, but when it comes to visualisation, nothing beats this site: https://www.airvisual.com/earth" https://www.airvisual

"I used to use that when I lived in Beijing, but when it comes to visualisation, nothing beats this site: https://www.airvisual.com/earth" https://www.airvisual.com/earth" Which sensor network does that site get data from ? Also, as I look at this map today, what is going on just northeast of Mexico city ?