The best replacement for pollution is contamination.

The best alternatives to pollution are rated as following:
★★★★★  contamination
★★★★  global warming
★★★★  water pollution
★★★  population
★★  man made pollution
★  gasoline pollution
★  air
★  purity
★  air pollution
★  nonpoint source pollution
★  captain planet
★  farming and air pollution
★  outdoor air pollution
  human pollution
  volcano
  car pollution
  conservation
  waste
  environment:
  us pollution
  rural pollution
  physical pollution

Your alternative for pollution is not listed? Suggest!
Speaking about pollution, one probably shouldn't forget about coal.

Other search terms related to pollution and their ratings are:
★★★★★ coal
You have in mind a companion for pollution and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of pollution in all years. Click on graph for more.
pollution
contamination
global warming