Depends who does the analysis. Results can always be skewed. For instance, placing thermometers at airports creating proximal causality from all that jet exhaust, burning kilotons of kerosene. Then you got the artificially heated Urban Heat Island effect! And on and on...................... deck stacking for the desired result.
It's a bit hard to believe that everyone does their analysis of Co2 levels at local airports but I could be mistaken. I'm hopping out of this clickbait thread 
Not everyone, just those who would propagandize global warming, God knows, there are enough of those charlatans.