Whenever i go outside i get a bad smell

Ok so here's the thing. I have really bad allergies. They have been bugging me recently, and it's kinda the usual no taste or smell, stuffy nose, that kinds of thing. But there has been something happening recently that I have never experienced in my 4 years of bad allergies. Whenever I go outside, I smell something really bad. It's not a specific smell so I can't really describe it but it's really bad. What's odd is I have no sense of smell. If I stay outside, it comes back after like 10 seconds. I tried googling it but nobody seemed to have the same problem. Anybody know what I'm talking about?