alt Hacker NewsThe GP is not talking about removing CO2 from the air.
Even though no, it's not as simple as they put it, plants do remove particles from the air, humidify it, and emit plenty of stuff on their own (what may or may not be good). You don't need a lot of them to have a large impact.
That is correct. I was trying to make a basic statement. We should be careful not to make excessive claims about the benefits of houseplants, but generally speaking I think they are a benefit.