Your advice is somewhat dangerous if people follow it expecting them to magically work. First, the NASA study is for VOCs, not pm2.5. Second, when I briefly looked into using plants to clear VOCs indoors, I found that the number of plants, lights, and air-circulation required is completely impractical. Plants are awesome, I love them, but they're not enough. I wish it wasn't so.
It would be stupid to expect plants to clean up PM 2.5 material. The best they can do is chemicals. Sure they aren't a perfect solution but then again, anecdotal evidence from my childhood says thatmore plants are better for our environment. Indoor/outdoors doesn't matter.
And yes it isn't a magical solution, we have to be careful while placing plants in our house.
