What are the two most common pollutant pathways? What will be ...

[mynx]

What are the two most common pollutant pathways?
 
  What will be an ideal response?

Question 2

Do recovery cylinders need to be labeled?
 
  What will be an ideal response?

[joshraies]

Answer to Question 1

Outside to inside
From one area inside to another area inside

Answer to Question 2

Yes. Each container should be labeled with the filler's name, address and date filled. The cylinder should be labeled with a DOT four-by-four green, diamond shaped nonflammable gas label. Each container should display a precautionary label prepared in accordance with ANSI Z129.1, American National Standard for Hazardous Industrial Chemicals  Precautionary Labeling. In addition Federal Law 49 CFR Sections 172.301 and 172.302 must be followed.

[mynx]

Great answer, keep it coming

[irishcancer18]

YES! Correct, THANKS for helping me on my review