Agreed, the variation in the chart is pretty small. Though, if you near a large CO2 source (e.g. a city) it can be 100ppm+ higher (just staring at some CO2 met

Agreed, the variation in the chart is pretty small. Though, if you near a large CO2 source (e.g. a city) it can be 100ppm+ higher (just staring at some CO2 meters right now).