7 Surprising Reasons You Have Dark Circles Under Your Eyes

"The carpeting and upholstery in a car can harbor dust mites, mold spores, and pollen, just like in a home," Batra said. The best way to keep it clean is to make sure carpeting is vacuumed, then covered with a plastic, washable floor mat. "This will help prevent allergens from collection. And for the seats, vacuum frequently and avoid furry or woolly covers, since those can attract more dust and mold spores," she added.

A tip? Leather seats are the best choices for the allergy-prone. Other sources of allergens in a car are dirty air vents, filters, and dusty dashboards, so be sure to clean these frequently also.