These air filters were designed by residents of Beijing as a low-cost alternative to expensive air filters.

They are not professional-grade air filters but are a workable alternative. As fire-season is about to begin on the West Coast, and it seems that climate change will make future fire-seasons worse and more frequent, DIY solutions to air quality problems will become more necessary, unless we can get the regulators to do their jobs and industrial polluters, like Owens-Brockway, to stop killing they neighbors with toxic emissions.