Since most sources of noise pollution are caused by essential machines, it is not possible to decrease the levels of sound.
true
false

It would be false. 

You can do things to protect your hearing, e.g. wearing headphones or earplugs if you have to, or leaving the premises if the noise is becoming unbearable or painful. I often have to do this especially because I'm more sensitive to sounds than others, while sometimes you can't decrease the noise you can still protect yourself and your hearing. I hope this was helpful! :)