pollution

pollution /pəˈluːʃən/ noun
pollution
/pəˈluːʃən/
noun
Britannica Dictionary definition of POLLUTION
[noncount]
1 
: the action or process of making land, water, air, etc., dirty and not safe or suitable to use
2 
: substances that make land, water, air, etc., dirty and not safe or suitable to use
— see also light pollution, noise pollution