Michael Busch on Nostr: Outdoor CO2 levels over the ocean can closely approximate the global average, due to ...

Outdoor CO2 levels over the ocean can closely approximate the global average, due to atmospheric mixing. That's why the Keeling curve measurements have been taken from Mauna Loa in 1958.

For a minimum measurement:

Put the CO2 monitor into a sealed greenhouse during the day and watch it drop down to 150-200 ppm.