The "dust" would be ash. Most plants will not appreciate ash on them or around the roots. No harm bringing them inside for a few days if that is convenient.

Just hose the ash off and leave them be.

Leave your plants out doors and water them from above. We don't expect any cold spell yet.

Jordi

Actually, bad air quality for humans is good air for plants...the burning of vegetable matter not only produces carbon monoxide (equal to car exhaust), but carbon dioxide (equal to what humans produce) the plants in return produce oxygen!!!

Put them outside, they'll thank you for it...