Air isn't free as such, either, because of pollution. The moment you pollute air you are degrading its quality, up to the point that certain equipment has to ac

Air isn't free as such, either, because of pollution. The moment you pollute air you are degrading its quality, up to the point that certain equipment has to actively filter the air before using it. Also keep in mind that "pollute" for example in denser settlements can also mean smells, e.g. someone is constantly cooking stuff that strongly smells and you live "downwind" of that, would you consider air as "free" or should there maybe some limit to what can be done with it?