Respirators and Goggles
Respirators that filter both particulates and VOCs (Volatile Organic Compounds) are a good choice. They are better than particulate masks although not, of course, as good as a Self-Contained Breathing Apparatus (SCBA) like firefighters use. Those, however, cost thousands of dollars. For $20 or a little more, respirators that filter out both particulates and VOCs offer more protection than masks that filter out only particulates. We think the extra margin of safety is well-worth the slightly higher cost.
If a respirator is out of reach financially, at a minimum include a P100 or equivalent particulate mask.
Goggles are highly recommended too. In some evacuation situations, the smoke will be so heavy that it will irritate your eyes and make it difficult to keep them open. Goggles help protect your eyes from that irritation.