Hacker News Reader

CO2 concentration seems to depend on actual location:

https://www.researchgate.net/figure/The-maps-of-global-histo...

This paper show differences of ~10% across the globe. Doesn't say anything about co2 concentrations being 2x higher in the cities.

(Actual readings from Seattle, as an example) https://www.pmel.noaa.gov/co2/story/Space+Needle

Older study https://www.sciencedirect.com/science/article/abs/pii/S13522...

... tldr a higher planetary boundary layer over cities can form under various weather conditions. That reduces mixing, and cities are large sources of CO2.

Thanks for the links. It's still not 2x, but 25-75% under specific atmospheric conditions is more than I would've thought.

So I can say - I stand corrected, and TIL :)

I think the 2x is an extreme. There are some articles (which I have not verified) talking about how Paris reached 900+

Anywhere that traps smog should show similar correlations with CO2.

Reply on news.ycombinator.com