On a different subject... So Windy.com recently added some more data (click Additional Data/More Data on the side)

One of them is CO2.

In my heavily forested area it reads 79 PPBV. I'm confused because I've always thought we're in the 300-400 PPM for CO2. But if I got this right, 79 PPBV converted to ppm is .079ppm CO2... No? I was expecting a higher number. Something wrong about the V here in the number, volumetric meter I am assuming?

if you click around in the metro areas around the country it does read what I think is 200-400ppbv as expected.

Maybe somebody here can explain: What's the difference between ppbv and ppm?

https://www.windy.com/-Show---add-more-layers/overlays?cosc,...