This really depends on the rate at which air inside the house gets exchanged with air from the outside.
In my 2008 house, two air purifiers on low are sufficient to keep AQI at 0 and in the single digits during wildfires. They're rated for about 350 square feet each, while the house is about 1500 square feet.
Yes, completely true - if you had a home with positive pressure and a filtered HRV/ERV with sufficient volume, one wouldn't need internal air purifiers at all.
I've long wished for "smart" inwards-blowing window fans that took filters and conditionally only turned on when the air outside was an appropriate temperature - wouldn't be appropriate in all climates/seasons/times, but in my geography would pump clean air in into the house for months out of the year.
In my 2008 house, two air purifiers on low are sufficient to keep AQI at 0 and in the single digits during wildfires. They're rated for about 350 square feet each, while the house is about 1500 square feet.
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