Do the Pico H and Pico WH plug straight into the Enviro+?
The sales pages don’t mention it so I’m guessing the headers are the wrong way round or something?
Also.
It is possible to permanently power both this Enviro+ board and a connected PMS5003 (via Picoblade cable) from the USB connector on the Pico via a suitable Amperage mains PSU?
Do the Pico H and Pico WH plug straight into the Enviro+?
Yes, Pico H and Pico WH will work fine with Pico Enviro+ Pack.
It is possible to permanently power both this Enviro+ board and a connected PMS5003 (via Picoblade cable) from the USB connector on the Pico via a suitable Amperage mains PSU?
Also yes, USB power to the Pico’s microUSB will power the Pico, Enviro+ and the PMS5003 sensor :)
That label is just to show you which way round to plug the Pico into the pack - if it’s plugged in correctly the Pico’s microUSB port should line up with the USB label on the pack.