Hi @ josalarcon2, a useful hunt.
The idea of putting a bicycle filter is very useful for a clean planet.
It would be even better if the filters were sold as accessories and if the current bicycle owners accepted the idea of air cleaning in this way.
The filter does not take up much space and does not mind the normal ride of the bike.
If all the bicycle owners set up this filter, the cleaning effect would not be negligible.
Everything should be backed up by some data such as the amount of air contaminated on the surface of 1 square kilometer and the amount of air that "cleanses" such bicycles.
This would give a picture of the purpose of the cleaner on bikes.