Hi lilipenphon,
Thank you for your question. I've not experienced this, but have discovered almost anything seems possible with migraine disease. I wonder if the air filters needs to be changed in the car and/or bus. I suspect, if an air filter keeps out potential odors and pollutants and needs a change, it could result in triggering a migraine attack. Allergens, and poor air quality can certainly trigger a migraine attack.
Hopefully others will be in shortly to share their experiences with you.
Nancy