If you are talking about things like PM10 or PM2.5, then it would be infeasible to re-add an identical or even plausibly equivalent pollutant, unless it's the o

If you are talking about things like PM10 or PM2.5, then it would be infeasible to re-add an identical or even plausibly equivalent pollutant, unless it's the one removed. By definition, it is a concentration of things small and solid. Whether they are ground tires, engine soot, rock/dirt, pollen, mold spores or powdered cyanides, they are counted the same. If you wish to replicate pollutants, then consider ethical implications of: Looks the same to me, my colleagues and everyone I know, yet it's not, or is it?