Allergy season would be a thing of the past. Another thing you could put in them are giant dehumidifiers (moisture farms). Filter the water and you could store it in a water tower. Then you can use that as a thermal battery/emergency clean water supply.
Build 75m tall towers in every city and fill them basement to roof with hepa filters.
Bring new meaning to the term “skyscraper”
HEPA would remove particulate but not CO2 or methane emissions, which are what drive climate change.
We’d have some clean ass air for sure though.
Allergy season would be a thing of the past. Another thing you could put in them are giant dehumidifiers (moisture farms). Filter the water and you could store it in a water tower. Then you can use that as a thermal battery/emergency clean water supply.
The key is to have something that the masses would use. Something disguised as another product, powered by renewables.
Radical, but probably expensive AF