Brian, can both downloads (ie: from the Thingspeak cloud storage and the local network) be done or is it one or the other but not both?
Might be practical if both downloads could simultaneously be done (take place), if technically possible - both ‘airquality.txt’ (from the local network download) and ‘airquality2.txt’ (from the Thingspeak cloud storage download) could be created/produced at regular intervals and possibly uploaded to the same directory where Weather Display normally uploads its data files (such as for example, ‘clientraw.txt’, etc.).
Having both PurpleAir data files produced and uploaded would allow PHP script developers to process that data and use it on web pages.