4 ms·

if high CO2 equals more risk of contamination then Japan should be getting large transmissions of COVID in over-saturated trains on a daily basis, but it does n

if high CO2 equals more risk of contamination then Japan should be getting large transmissions of COVID in over-saturated trains on a daily basis, but it does not. So this data seems more junk than anything else.

SapporoChris 4y ago
I think you are being hasty. Japan has amazing mask discipline which could account for the differences. Also, like many countries train travel was reduced during the pandemic as more companies began allowing telecommuting and flexible hours. Second, I found a wealth of articles just by searching: japan train ventilation Train operators already have good methods in place: https://www.jreast.co.jp/e/customer_support/corona-info/index.html https://www.jreast.co.jp/e/customer_support/corona-info/inde... It looks like the frequent stops are very good at ventilating the trains: https://www.nippon.com/en/news/yjj2020112601115/ https://www.nippon.com/en/news/yjj2020112601115/ But they recognize the the problem: https://eandt.theiet.org/content/articles/2020/07/trains-and-crowded-areas-need-ventilation-to-prevent-covid19-spread-study-shows/ https://eandt.theiet.org/content/articles/2020/07/trains-and...
dzhiurgis 4y ago
So I assume you at least have some data on japan trains co2?
graeme 4y ago
What's the CO2 in those trains? Japan tends to have great ventilation and has CO2 meters around the place. It isn't impossible to ventilate a train well. I've been on a train with CO2 around 600 and another around 3,000. Air system design matters However, one train in Japan did have very high levels based on a transport ministry study: https://www.asahi.com/ajw/articles/14515055 https://www.asahi.com/ajw/articles/14515055
- ekianjo 4y ago
  > It isn't impossible to ventilate a train well. Not for the trains at rush hour in Tokyo.

4 ms·

if high CO2 equals more risk of contamination then Japan should be getting large transmissions of COVID in over-saturated trains on a daily basis, but it does n

by ekianjo 4y ago

SapporoChris 4y ago
I think you are being hasty. Japan has amazing mask discipline which could account for the differences. Also, like many countries train travel was reduced during the pandemic as more companies began allowing telecommuting and flexible hours. Second, I found a wealth of articles just by searching: japan train ventilation Train operators already have good methods in place: https://www.jreast.co.jp/e/customer_support/corona-info/index.html https://www.jreast.co.jp/e/customer_support/corona-info/inde... It looks like the frequent stops are very good at ventilating the trains: https://www.nippon.com/en/news/yjj2020112601115/ https://www.nippon.com/en/news/yjj2020112601115/ But they recognize the the problem: https://eandt.theiet.org/content/articles/2020/07/trains-and-crowded-areas-need-ventilation-to-prevent-covid19-spread-study-shows/ https://eandt.theiet.org/content/articles/2020/07/trains-and...
dzhiurgis 4y ago
So I assume you at least have some data on japan trains co2?
graeme 4y ago
What's the CO2 in those trains? Japan tends to have great ventilation and has CO2 meters around the place. It isn't impossible to ventilate a train well. I've been on a train with CO2 around 600 and another around 3,000. Air system design matters However, one train in Japan did have very high levels based on a transport ministry study: https://www.asahi.com/ajw/articles/14515055 https://www.asahi.com/ajw/articles/14515055
- ekianjo 4y ago
  > It isn't impossible to ventilate a train well. Not for the trains at rush hour in Tokyo.