Pollution is the introduction of contaminants into the environment that cause HARM or discomfort to humans and other living organisms. FOULNESS, with 8 letters, is an unpleasant smell or taste. MIASMA, with 6 letters, is a noxious atmosphere or vapor. ADULTERATION, with 12 letters, is the process of making something impure by adding inferior or tainted substances. ROT, with 3 letters, is the process of DECAY caused by bacteria or fungi. DECOMPOSITION, with 13 letters, is the breakdown of organic matter into simpler substances. PUTREFACTION, with 12 letters, is the DECOMPOSITION of organic matter by bacteria or fungi, resulting in a foul smell. HARM, with 4 letters, is physical or psychological injury. REEK, with 4 letters, is to emit a strong, unpleasant smell. ABUSE, with 5 letters, is the improper use of something. CORRUPTION, with 10 letters, is the act of changing something from its original state to a worse one. DECAY, with 5 letters, is the gradual decline of something. DETERIORATION, with 13 letters, is the process of becoming worse. VIOLATION, with 9 letters, is the act of breaking a law or rule. IMPAIRMENT, with 10 letters, is the act of making something worse. DEFILEMENT, with 10 letters, is the act of damaging something's purity. IMPURITY, with 8 letters, is the state of being contaminated or polluted. SMOG, with 4 letters, is a type of air pollution caused by smoke and other pollutants.