Steven DeVald profile image 79

Why can't we build a stadium sized air cleaner in major cities and filter the air?


 

sort by best latest

pendell2 profile image72

pendell2 says

You can help the HubPages community highlight top quality content by ranking this answer up or down.

7 years ago
 |  Comment
canadawest99 profile image61

canadawest99 says

You can help the HubPages community highlight top quality content by ranking this answer up or down.

6 years ago
 |  Comment