the act of polluting or the state of being polluted.

the introduction of harmful substances or products into the environment

air pollution.

noun

cleanliness , purification

noun

abuse , adulteration , besmearing , besmirching , blight , corruption , decomposition , defilement , desecration , deterioration , dirtying , fouling , foulness , impairment , impurity , infection , misuse , polluting , profanation , rottenness , soiling , spoliation , taint , tainting , uncleanness , vitiation , sophistication , dirtiness , unwholesomeness , contamination , infectiondebasement , poison , smog , uncleanliness , waste