Be a big spender and opt for new filters. If the air quality was really bad a shorter oil change interval might help.
I got caught up helping neighbors with horses in the Kitchen Creek Fire of September 1970 in San Diego (officially known as the Laguna Fire
). The fire was mostly east county but you couldn't see the sun at noon driving at the beach. I helped move horses out of the burn areas. We rescued a lot of wild animals too. I was driving in that stuff for 5 days.
At the time I had access to a lab and the oil analysis on my vehicle was terrible. I changed the air filter, oil and oil filter. My vehicle was a new 1970 Ford E-300 Econoline van with a 302 V8 and a stick shift. Cars in those days did not have cabin air filters. I also changed the fuel filters and poured in a lot of fuel system cleaner. I had an Oildex catch can/PC valve on the engine with a 2-barrel carb and the jar was full of nasty, gooey, oily stuff. I drove hundreds of miles towing a horse trailer overloaded with cranky, scared horses. Horses don't like catching on fire. It took me some time to recover too from burns, singed hair, burning eyes, plugged up nose and blisters. After that, you couldn't pay me enough to be a firefighter. I like being able to grow hair and breath through my nose.
The soot was difficult to remove from everywhere and it got into everything.