If you take insulin and live in a high traffic area, consider moving. "High traffic area" here means living within 100 meters of one or more roads with more than 20,000 vehicles/day.
People on insulin living next to roads with heavy traffic had markedly increased concentration of C-reactive protein, a marker of inflammation, compared to those living in lower traffic areas, a two-year epidemiological study has found. Individuals taking oral diabetes medications did not experience increases in CRP concentration.
"C-reactive protein (CRP) concentration increased 75-200% over the two-year period for those 10% of study participants living in the highest traffic areas who were using insulin when compared to those living in lower traffic areas.
Until you can relocate, I recommend using HEPA filters in your living spaces.