pollution vs toxic waste

pollution

noun
  • Physical contamination, now especially the contamination of the environment by harmful substances, or by disruptive levels of noise, light etc. 

  • Moral or spiritual corruption; impurity, degradation, defilement. 

  • Something that pollutes; a pollutant. 

toxic waste

noun
  • Any waste that can cause death or injury to living creatures, especially poisonous chemical compounds. 

How often have the words pollution and toxic waste occurred in a corpus of books? (source: Google Ngram Viewer )