Singapore

CO2 levels around 1300 on the subway, despite it being quite crowded.

Not too bad!

The medium-high CO2 and low PM2.5 in a crowded space suggest that both ventilation and filtration are being used.

tbh this is the nerdiest flex I’ve seen on public transit, and I respect it

My casts are immutable, but my opinions might get a soft fork… followed by @woj.eth 🎖️

intori

Ethereum

Not sure about it, I’ve seen different names elsewhere. But you can search google for CO2 or use the same picture for google search

It’s used for real time environmental monitoring