Thanks for the offer Adam! I am measuring the grills now - they are curved, which might make it a problem, but let me see if I can work around it. If I can't, I am going to check with the people who make my home air cleaner (80 ft2 HEPA, 13 lbs Activated charcoal) and see how difficult it would be to make a "basket" of activated charcoal to suspend inside the AC intakes, or see if a 3M charcoal filter mask might work.
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E