Indeed, Brian, you could use both URL. But…
I still think that the data from the Thingspeak cloud storage (ie: ‘https://map.purpleair.org/json?show=SENSOR_ID’) should be the default procedure (option) and, true, we would obtain the data for PM2.5 (only), but the data for both channels - we would have a backup channel.
There could be an option to also download a single channel with the data for all three PM (PM2.5, PM1.0 and PM10.0).
That is why in a previous message I was suggesting that the software ‘cronairquality.exe’ had the flexibility to possibly use an external setting file so that the software ‘cronairquality.exe’ could download data from multiple locations/sites without overwriting the saved data file (thanks to its external configuration file).