Traffic induced asthma and fume sensitivity.

I moved house a month ago after having to move from a house that had a damp/mold issue. We were only there 2 months and slept in our campervan the whole time (to prevent health issues!). Anyway, we are about 150m away from a really busy motorway here, and after about a week after we moved in I noticed I was having trouble breathing. I've never had asthma in my life before, but I do have a lot of other health issues (fatigue, multiple intolerances and allergies, severe sinus infection, candida, parasites etc). I bought an air purifier which seems to have helped with my breathing but I am now feeling a bit nauseous/anxious when I am at home (which is a lot!).

I've just had some serious dental work done which is hopefully going to help my health overall, but I am really worried that by being here it's going to damage my chances of getting well. Does anyone have any good solutions for traffic-induced asthma and sensitivities to the gases emitted by traffic? I have just ordered some camu camu as a natural vit c supplement but need some other options. Thanks in advance.