3 ms·

> If you are indoors you are likely breathing 1000ppm already. Not if you have ventilation or leave the window open. > Some large cities already at 900ppm. W

> If you are indoors you are likely breathing 1000ppm already. Not if you have ventilation or leave the window open. > Some large cities already at 900ppm. Which ones? I read online that New York can go up to 500 ppm and Shanghai up to 550 ppm. > OSHA limits on CO2, might be useful I find it very plausible that higher order cognition is the first thing to be negatively impacted, before macro-level symptoms like headaches or drowsiness start manifesting at 10,000+ ppm.

inter_netuser 5y ago
https://pubmed.ncbi.nlm.nih.gov/17100666/ https://pubmed.ncbi.nlm.nih.gov/17100666/ 1000pm in Shanghai classrooms, windows open: "The air exchange rate was 2.9-29.4 ac/h (mean 9.1), because of window opening. Mean CO2 exceeded 1000 ppm in 45% of the classrooms." 1000pm is a non-event. Life survived multiple extinction-level asteroid impacts. We've adapted to much worse in the past. At the worst, people will have indoor/car CO2-removers, just like you cannot really survive without an AC everywhere in Middle East (or Arizona) today. Maybe we'll just have to get some more indoor plants.
- fighterpilot 5y ago
  > 1000pm in Shanghai classrooms You said "some cities", so I presumed you meant outdoors. Of course in a crowded room it can reach 1000 ppm (or much higher) without the proper ventilation. This finding has nothing to do with the city of Shanghai. And yes, the "window open" comment I made was for a room with 1 person in it like a bedroom. If it's crowded then obviously more effective ventilation will be needed. > 1000pm is a non-event Well the study this thread is based on is directly contradicting that. Do you know of any studies that shows that 1000 ppm has no negative impact on higher order cognition? > Maybe we'll just have to get some more indoor plants. Indoor plants aren't effective at reducing indoor CO2.
  - breput 5y ago
    In fact there are studies that show that even moderately high classroom CO2 levels are correlated with poor outcomes. https://pubmed.ncbi.nlm.nih.gov/25117890/ https://pubmed.ncbi.nlm.nih.gov/25117890/

inter_netuser 5y ago

https://pubmed.ncbi.nlm.nih.gov/17100666/ https://pubmed.ncbi.nlm.nih.gov/17100666/ 1000pm in Shanghai classrooms, windows open: "The air exchange rate was 2.9-29.4 ac/h (mean 9.1), because of window opening. Mean CO2 exceeded 1000 ppm in 45% of the classrooms." 1000pm is a non-event. Life survived multiple extinction-level asteroid impacts. We've adapted to much worse in the past. At the worst, people will have indoor/car CO2-removers, just like you cannot really survive without an AC everywhere in Middle East (or Arizona) today. Maybe we'll just have to get some more indoor plants.

fighterpilot 5y ago
> 1000pm in Shanghai classrooms You said "some cities", so I presumed you meant outdoors. Of course in a crowded room it can reach 1000 ppm (or much higher) without the proper ventilation. This finding has nothing to do with the city of Shanghai. And yes, the "window open" comment I made was for a room with 1 person in it like a bedroom. If it's crowded then obviously more effective ventilation will be needed. > 1000pm is a non-event Well the study this thread is based on is directly contradicting that. Do you know of any studies that shows that 1000 ppm has no negative impact on higher order cognition? > Maybe we'll just have to get some more indoor plants. Indoor plants aren't effective at reducing indoor CO2.
- breput 5y ago
  In fact there are studies that show that even moderately high classroom CO2 levels are correlated with poor outcomes. https://pubmed.ncbi.nlm.nih.gov/25117890/ https://pubmed.ncbi.nlm.nih.gov/25117890/