Step 1: Recall what the Basel Convention was created for.
This treaty came about after concerns grew over rich countries dumping dangerous waste in poorer ones.
Step 2: Identify its focus.
It sets rules for how hazardous waste can be moved across borders and disposed of safely, aiming to cut down generation of such waste in the first place.
Step 3: Match it to the option.
Since its entire focus is on hazardous waste movement and management, that is the correct answer, not air pollution, noise, or radiation.
\[ \boxed{\text{Hazardous waste}} \]