I am using the meaning that is understood by most people. i.e. pollution is something like toxic waste or smog. Dictionary definitions are irrelevant when having public discussions. The generally understood meaning is what is important.
You don't get to change the definition to suit your error in thinking. The dictionary definition IS the meaning understood by MOST people. You can use a different word to describe what you are talking about, but if we are talking about "pollution" then it includes naturally occurring compounds in high concentrations, as stated.