A
or you can, you can, you know, do, uh, testing on the ground itself at that point,
B
Uh-huh.
A
but when they pollute into the air and you've got, you know, and you've got movement through the air, it's going to move a lot of that off. So, I don't see, you know, how they can do some of the te-, unless it just hangs there like in places where it's a lot of pollution, you know, like in Los Angeles or, or the bigger cities where it, it tends to get stuck there,
B
Uh-huh.
A
you know, that you have a lot more particles in the air,
B
Right, yeah.