- Dust and dust
- Flowers and plants (especially pollen)
- Soot and airborne particles
- Some foods (especially tomatoes, spices, sauces, salty foods, peanuts, walnuts, seafood, canned goods, all kinds of chocolate and sweets)
various medicines - All kinds of perfumes and essential oils
- Acids and chemicals and petroleum products, detergents with pungent and burning odors
- Types of mold
- Woolen and fluffy fabrics
- Feathers, feathers, skins of birds and animals
- Severe cold or sudden and severe temperature change
- dry air
- Extreme humidity (such as saunas and hot springs)
- Stress and mental anxiety
- Heavy physical activity and exercise (especially in cold or polluted weather)