I have bad sinus problems. I have to stay indoor from October to January and again from April to June. I practically stop breathing whenever I am near any diesel vehicle. Well they are doing remodeling next door to me and are using a bobcat/diesel . I had to go outside to talk to the landscaper and I had NO ALLERGIC REACTION TO THOSE FUMES.......THANK YOU FATHER GOD., SMARTY, GALACTIC'S AND EVERYONE ELSE.