View Single Post
Old Dec 13, 18, 5:45 pm
  #5  
Dr. HFH
FlyerTalk Evangelist
 
Join Date: Jan 2007
Location: BOS/UTH
Programs: AA EXP, LT PLT; QR PLT; Bonvoy LT TIT
Posts: 11,825
A mask will help greatly with particulate matter (the result of burning off crops, etc., visible smoke, generally) but not really with gasses like vehicle exhaust fumes.
Dr. HFH is offline  
Reply With Quote