Yes, smog is usually heavier than air (oxygen+nitrogen mix). If you do not blow it up there on purpose you can filter it and get it outside of the city. https:

Yes, smog is usually heavier than air (oxygen+nitrogen mix). If you do not blow it up there on purpose you can filter it and get it outside of the city. https://ephtracking.cdc.gov/showAirContaminants.action https://ephtracking.cdc.gov/showAirContaminants.action