Follow the advice of your doctor especially those with heart or lung disease.
Wet or dry cloths, dust, or surgical masks do not protect you from ozone or fine particulates.
If you are a healthy adult, respirators marked NIOSH N95 can provide some protection from fine particulates with adequate fit testing and if you must be outside.
Stay hydrated.
Keep indoor air clean; don't burn candles, vacuum, or smoke tobacco products.
Use a portable air purifier. Create a clean air room in your home.