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Perfume

Fragrances can contain hundreds of chemicals that are mostly untested on humans, Dr. Wedner says. When those chemicals bond with the essential oils in perfumes and are then sprayed into the air, sensitive people may take offense. Sneezing, congestion, and headaches can be the result.

What to do: Kindly ask your colleagues to go easy on their favorite fragrances, and bring a portable fan to keep your area as scent-free as possible. Stick with body creams and moisturizers that have light scents. These are less likely to irritate you.

Next: Soaps and detergents