All you need is a box fan, good air filters and some ... Use HEPA air purifiers and other methods HEPA (for high-efficiency particulate air) filters are used in many air purifier machines.

The best air purifiers can help filter fine particles, gases and other pollutants from the air you breathe. See our top picks ...

As three major fires continue to burn in the Los Angeles area, 17 million residents are affected by the drifting smoke. An air purifier with a HEPA filter can help.