^^^ I second this. It's possible that something in your body has changed and now even a little bit of diesel is affecting you where it didn't before. My wife developed a problem against dust and paint fumes. I'll spray paint something in the cellar and she'll come in the house and complain she's got breathing problems as soon as she walks in the door. It might not be the fumes as much as what's going on in your body. That being said, I do agree that any fumes from anything are not good for humans, but they're there and we'll have to live with them. edited to add: Don't complain too loudly or Obama will have us all driving electric tractors.