Nitrogen is not an element, but a pollutant made by man.
Don’t you remember your chemistry?
Yeah but by far the worst is dihydrogen monoxide. That stuff needs to be banned. #banDHMO
Of course, just like carbon dioxide.
Maybe you would like to review your high school chemistry!
Nitrogen is an element and a term often used to describe a molecule N2. Which ~78% of air is composed of - naturally.
What they are complaining about are other nitrogen containing molecules such as nitrogen oxides (NOx) or ammonia NH4+. Which are in fertilizers, decayed bodies and fecal matter/urine.