How to build a box fan air filter to escape the Canada wildfire smoke

The east coast is receiving an unwelcome taste (and scent) of the climate crisis to come as smoke from massive Canadian wildfires billow out towards the Atlantic Ocean. Eerily reminiscent of what the West Coast endured in 2020, the skies above New York City this week have turned a hazy orange, setting AQI scores jumping across the five boroughs. New York on Wednesday ranked as having the second worst air quality on Earth behind Delhi.